NEPTUNE PLANET

 Neptune

 

  What does Neptune look like?

  Neptune's moon

 

  Neptune is the eighth planet from the Sun in our solar system.  According to NASA, this blue gas giant is much larger than Earth, 17 times the mass of Earth and about 58 times the volume of Earth.  The rocky portion of Neptune is surrounded by a muddy liquid mixture of water, ammonia, and methane ice.

 

  Astronomer Galileo Galilei was one of the first to identify Neptune as a space object, but he assumed it was a star based on its slow motion.  Nearly two hundred years later, in 1846, the French astronomer Erbine Jean-Joseph Le Warrier estimated the location of Neptune by studying the gravitational disturbances in the movements of Uranus, according to researchers at the University of St Andrews in Scotland.  According to a summary.  .

  

  1 minute, 0 seconds out of 4 seconds

  Play the sound.

  At the same time, Le Warrier was calculating the existence of Neptune, as was the English astronomer John Couch Adams.  The two scholars independently made almost identical mathematical predictions about the existence of Neptune.  Le Warrier then reported his calculations to his colleague, the German astronomer Johann Gottfried Gale, and Gale and his assistant Henrik de Aristt, after seeing Neptune through binoculars at his observatory in Berlin, identified it.  Confirmed Le Warrier's predictions.

  According to all the other planets in the sky, and as Le Warrier suggested, this new world was given a name from Greek and Roman mythology - Neptune, the Roman god of the sea.

  Related: The Biggest Mystery About Neptune

 

  The only mission Neptune flew was Voyager 2 in 1989.  Even today, many mysteries remain about the cold, blue planet, such as why its winds are so strong and why its magnetic field is moving.  Although Neptune is of interest because it is in our own solar system, astronomers are also interested in learning more about the planet to help study the exoplanet.  In particular, astronomers are interested in learning about the habitation of a world larger than Earth.

  Like Earth, Neptune has a rocky center, but its atmosphere is so thick that it forbids the existence of life as we know it.  Astronomers are still trying to figure out where the planet is so large that a large amount of gas could accumulate in its area, making life difficult or impossible.

  What does Neptune look like?

  The result of the absorption of red light by methane into the still unknown compound and most of the planet's hydrogen helium atmosphere.

  Despite Neptune's distance from the sun, which means it receives very little sunlight to help warm and run its atmosphere, Neptune's winds can reach 1,500 miles per hour (2,400 kilometers per hour).  Is the fastest ever in the solar system.  The winds were linked to a major black storm that Voyager 2 tracked in the southern hemisphere of Neptune in 1989.  This elliptical, clockwise "Great Dark Spot" was large enough to envelop the entire earth, and moved westward at a speed of about 750 miles per hour (1,200 kilometers per hour).  The storm disappeared when the Hubble Space Telescope searched for it in later history, and since then, Hubble has seen the appearance and reappearance of other great black spots on Neptune over the past decade.

  Due to the high temperature and pressure on Neptune and Uranus, scientists believe that compressed carbon in the form of diamonds causes a "diamond rain" phenomenon on these icy giants.  In 2017, researchers were able to mimic the conditions that lead to the formation of diamonds in the lab, supporting the hypothesis that diamonds rain down on Neptune and Uranus.

 

  Ultrasonic Neptune is photographed using a ground-based telescope.

  0 seconds 1 minute, 12 seconds

  Play the sound.

  Neptune is surrounded by unusual circles, which are not uniform, but have bright thick clumps of dust called arcs.  Rings are thought to be relatively young and short-lived.  According to an article in the journal Icarus, ground-based observations announced in 2005 found that Neptune's rings were apparently more unstable than previously thought, with some rapidly declining.

  Neptune's magnetic poles are pointed at about 47 degrees relative to the poles with which it rotates.  Thus, the planet's magnetic field, which is about 27 times stronger than the Earth's, passes through wild swings during each rotation.

  By studying the formation of clouds on the gas giant, scientists have been able to calculate that a day on Neptune is less than 16 hours.  Neptune's elliptical, elliptical orbit keeps the planet approximately 2.8 billion miles (4.5 billion kilometers) or about 30 times farther from the Earth, which makes it invisible to the naked eye.  Neptune orbits the Sun about once every 165 Earth years, and completes its first orbit since its discovery in 2011.

  Every 248 years, Pluto orbits Neptune for 20 years or more, during which time it is closer to the Sun than Neptune.  Nevertheless, Neptune is the farthest planet from the Sun, as Pluto was reclassified as a dwarf planet in 2006.

  Neptune's moon

  Neptune has 14 well-known moons, named after lesser sea gods and nymphs than Greek mythology.  The largest Triton to date, discovered indirectly through beer on October 10, 1846 - amateur astronomer William Lasell, who discovered Triton, a wine maker to finance his telescopes.  Used funds created as

  Quick facts about Neptune

  - Atmosphere composition (by volume): 80% hydrogen, 19% helium, 1.5% methane

  - Magnetic field: about 27 times more powerful than the earth

  - Mass Composition: 25% rock, 60-70% ice, 5-15% hydrogen and helium

  - Internal structure: mantle mantle of water, ammonia and methane ice;  Iron and magnesium silicate core

  - Average distance from the sun: 2,795,084,800 miles (4,498,252,900 kilometers) (30,069 times higher than Earth)

  - Pierre Helen (closest view to the Sun): 2,771,087,000 miles (4,459,630,000 km) (29.820 times the Earth)

  - Ophelon (longest distance from the Sun): 2,819,080,000 miles (4,536,870,000 km) (30,326 times the Earth)

  (Source: NASA)

  Triton is Neptune's only spherical moon.  The other 13 moons of the planet are randomly shaped.  Triton is also unique as being the only large moon in the solar system to orbit its planet in the opposite direction of its planet's rotation - this "backward orbit" suggests that Triton may have been a dwarf planet someday.  Which was captured by Neptune instead of being in place.  According to NASA.  Neptune's gravity is bringing Triton closer to the planet, meaning that millions of years from now, Triton will be so close to the forces of gravity that it will tear it apart.

  Triton is extremely cold, with its surface temperature reaching about minus 391 degrees F (minus 235 degrees Celsius), making it one of the coldest places in the solar system.  Nevertheless, Voyager 2 detected a geyser spewing more than 5 miles (8 km) of icy matter, indicating that its interior appears warm.  Scientists are investigating the possibility of an underground ocean on an icy moon.  In 2010, scientists discovered seasons on Triton.

  Related: What would it be like to live on Neptune's moon Triton?

  In 2020, NASA announced the possibility of a new space mission to visit Triton, called Trident.  "Triton has always been one of the most intriguing and intriguing bodies in the solar system," said Louise Proctor, director of the Lunar and Planetary Institute at the Universities Space Research Association in Houston.

  In 2013, scientists working with SETI used data from the Hubble Space Telescope to observe Neptune's "lost" moon.  The 62-mile-wide (100 km) moon has been missing since Voyager 2 was discovered in 1989.

  Also in 2013, scientists using the Hubble Space Telescope discovered the 14th moon, called S / 2004 N 1.  It is the smallest moon in Neptune and is only 11 miles (18 kilometers) wide.  It got its temporary name because it is the first satellite (S) of Neptune (N) to be found in photographs taken in 2004.

PLOTO PLANE

 Astronomy

   Pluto

   Dwarf planet

 

 

   Is Pluto a planet?

   Who Discovered Pluto?

   How far is Pluto from the sun?

   Is Pluto's orbit circular or eccentric?

   Does Pluto have a moon?

   Pluto, the largest, most distant member of the solar system, was previously thought to be the outermost and smallest planet.  It was also considered to be the most recently discovered planet, discovered in 1930.  In August 2006, the International Astronomical Union (IAU), which has been accused by the scientific community of classifying astronomical objects, voted to remove Pluto from the list of planets.  This is a new classification of dwarf planets.  This change reflects astronomers' realization that Pluto is a major member of the Kuiper Belt, a collection of ice and rock debris left over from the formation of the solar system and is now orbiting the sun outside Neptune's orbit.  ۔  (For further discussion of the IAU difference between a planet and a dwarf planet and the change in Pluto's classification, see Planet.)

   Pluto

   Pluto as observed by the New Horizons spacecraft, July 13, 2015.

   NASA / Johns Hopkins University Applied Physics Laboratory / Southwest Research Institute

   Pluto cannot be seen in the night sky without the aid of the eye.  Its largest moon, Charon, is so close in size to Pluto that it has become common for two bodies to be called double systems.  Pluto is designated by the symbol.

   Britannica Quiz

   Space Odyssey

   "far off".  "Specially".  "Out of this world".  You may have heard abusive gossip, but how much do you really know about space ... cadets?  Join this quiz and start your journey of planets and universe.

   Pluto is named in Roman mythology for the god of the underworld (the Greek equivalent of heads).  It is so far away that sunlight, which travels at about 300,000 kilometers (186,000 miles) per second, takes more than five hours to reach it.  An observer standing on the surface of Pluto will see the sun as a very bright star in the dark sky, giving Pluto an average of 1 / 1,600 of the sunlight reaching the earth.  Pluto's surface temperature is so cold that ordinary gases such as nitrogen and carbon monoxide are present there as ice.

   Due to Pluto's remoteness and small size, even the best binoculars on Earth and in Earth's orbit can handle very little detail of its surface.  In fact, for decades, it has been difficult to determine basic information such as its radius and mass.  Pluto was not visited in July 2015 by the New Horizons, a US spacecraft that flew via Pluto and its four satellites, which answered many important questions about it and its environment.

   Basic astronomical data

   Pluto's average distance from the Sun, about 5.9 billion kilometers (3.7 billion miles or 39.5 astronomical units), gives it a larger orbit than the outermost planet, Neptune.  (An astronomical unit [AU] is the average distance of the Sun from the Earth; about 150 million kilometers [93 million miles].) Its orbit, in comparison to the planets, is unusual in many ways.  It is longer than any of the orbits of the planets, or eccentric, and more inclined towards the lunar eclipse (at 17.1)), the plane of the Earth's orbit, near which the orbits of most of the planets are located.  Traveling on its eccentric path around the Sun, Pluto differs from 29.7 AU, at its closest perihelion, to 49.5 AU, at its farthest aphelion.  Because Neptune rotates in an almost circular path at 30.1 AU, Pluto is for a small fraction of each revolution that is actually closer to the Sun than Neptune.  However, the two bodies will never collide, as Pluto is locked in a 3: 2 stabilization echo with Neptune.  That is, it completes two revolutions around the sun at exactly the same time that Neptune takes to complete three.  This interaction of gravity affects their orbit in such a way that they can never pass close to 17 AU.  Pluto last reached Perry Helen in 1989.  For about 10 years before and after that time, Neptune was farther from the sun than Pluto.

   Earth observations have shown that Pluto's luminosity varies with the duration of 6.3873 Earth days, which is now well established as the period of its rotation (cidral day).  Of the planets, only Mercury, which has a rotation period of about 59 days, and Venus, with 243 days, rotate more slowly.  Pluto's axis of rotation is at an angle of 120 ول to the length of its orbit, so that its north pole actually points 30 ° down from the plane.  (According to the convention, the top of the plane is taken in the direction of the Earth and the North Pole of the Sun; below, in the opposite direction.  Tilted.) This way Pluto rotates almost in a reverse direction (opposite the direction of rotation of the sun and most of the planets);  On its surface an observer would see the sun rising in the west and setting in the east.

   Compared to the planets, Pluto is also unique in its physical properties.  Pluto's radius is less than half that of Mercury.  It is only two-thirds the size of the Earth's moon.  Next to the outer planets - Jupiter, Saturn, Uranus and Neptune - it is surprisingly small.  When these properties are combined with what is known about its density and structure, Pluto seems to have more in common with the large icy moons of outer planets than with any other planet itself.  Its nearest twin is Neptune's moon Triton, which represents the same origin for both bodies (see Origin of Pluto and its moon below).  For additional orbital and physical data about Pluto, see Table.

   Basic data for Pluto

   * Pluto needs time to return to the same position in the sky as the sun, as seen from Earth.

   ** The smallness of deviation from the cedral day is due to the very large orbit of Pluto.

   Average distance from the sun 5,910,000,000 km (39.5 AU)

   The eccentricity of the orbit is 0.251

   The inclination of the orbit towards the lunar eclipse is 17.1

   Plutonian Year (Revolutionary Period) 247.69 Earth years

   Visual Intensity on Average Opposition 15.1

   Mean synodic period * 366.74 Earth days

   The average orbital speed is 4.72 km / s

   Radius 1,185 km

   Mass 1.2 x 1022 kg

   The average density is about 2 g / cm

   The average surface gravity is 58 centimeters per second

   Escape speed 1.1 km per second

   Circulation duration (Plutonin ciderl day) 6.3873 Earth days (retreat)

   Plutonin ie solar day ** 6.3874 Earth days

   Tilt of the equator towards the orbit (slant) 120

   The average surface temperature is about 40 K (8387 ° F, −233 ° C).

   Surface pressure (near paraffin) about 10−5 bar

   Number of known moons 5

   Pluto and Charon

   A mix of fine color images of Pluto (right) and Charon (left) taken by the New Horizons spacecraft.

   NASA / JHUAPL / SwRI

   Pluto's atmosphere

   Although the discovery of methane ice on the surface of Pluto in the 1970s (see surface and interior below) convinced scientists that the body has an atmosphere, it will have to wait until the next decade for direct observation.  Its atmosphere was discovered in 1988 when Pluto passed in front of a star as observed from Earth.  Before Pluto's disappearance, the star's light gradually dimmed, indicating the presence of a thin, very diffused atmosphere.  Since Pluto's atmosphere must contain vapor in balance with its ice, small changes in temperature must have a large effect on the amount of gas in the atmosphere.  During the years around Pluto's Peri Helen in 1989, when Pluto was a little colder than average, most of its frozen gases evaporated.  At that time the atmosphere was at or near its densest, which made it a good time to study the body.  In the year 2000, astronomers estimated the surface pressure in the range of a few to tens of microbars (one microbar is one millionth of the surface pressure of the earth).  In aphelion, when Pluto is receiving minimal sunlight, its atmosphere cannot be identified at all.

   A layer of fog over Pluto

   A layer of fog over Pluto, as observed by New Horizons.

   NASA / JHUAPL / SwRI

   Observations made during the magic show that nitrogen was the basic gas in the plutonium atmosphere, which also contained small amounts of methane, carbon monoxide and hydrogen cyanide.  (Nitrogen is an important component of Triton and Saturn's largest satellite, Titan, as well as the Earth's atmosphere.) During their flight, New Horizons determined the surface pressure to be 10 microbars, including acetylene, ethylene and ethane.  Found  Space.  The temperature near the surface is 45 K (−228 ° C, or 7379 ° F).  Fog layers can be seen up to 200 km (120 miles) high.  The upper atmosphere is quite expansive, moving 1,800 kilometers (1,100 miles) above the surface, and is quite cold, which prevents nitrogen from entering space.

   New Horizons near Pluto

   Artist offering New Horizons spacecraft approaching Pluto and its three moons.

   NASA / Johns Hopkins University Applied Physics Laboratory / Southwest Research Institute

   Surface and interior

   New Horizons observed only one hemisphere of Pluto.  This hemisphere is dominated by the Tombaugh Regio, a white heart-shaped field.  The western half of the Tombaugh Regio is Sputnik Planitia, a flat area of ​​nitrogen ice that has no effect.  The lack of craters suggests that Sputnik Planetia is a very young feature and thus Pluto may have some geological activity.  The Tombaugh Regio is surrounded by low-lying areas with some mountain ranges.  These mountains are made of water ice, which is probably floating in the surrounding nitrogen ice.  The upper northern latitudes are covered by deep plains.  Tombaugh is the darkest region of Pluto, west of the Regio.  Originally nicknamed the "Whale" because of its shape and later called the Chattulho Reggio, the region has a diverse topography with plains, spots, mountains and strongholds.  The darker color of this region is formed by organic compounds called tholan.

   Mountains on Pluto

   A close-up view of the mountains and plains on Pluto via the New Horizons spacecraft.

   NASA / JHUAPL / SwRI

   Pluto's average reflection, or albedo, is 0.72 (that is, it returns 55% of the light that falls on it), compared to 0.1 for the moon and 0.8 for Triton.  However, it covers a wide range of average albedo reflections, ranging from 0.1 to 0.2 for the Chattulho Regio and 0.8 to 1 for the Tombao Regio.

   The first crude infrared spectroscopic measurements (see Spectroscopy), performed in 1976, revealed the presence of solid methane on the surface of Pluto.  Using new ground equipment available in the early 1990's, observers discovered ice of water, carbon monoxide, and molecular nitrogen.  Although the spectral signature of nitrogen is very weak internally, it is now clear that this substance must be part of the dominant surface.  Methane is present in pure methane ice patches and in nitrogen ice as a frozen "solution" of methane.

   Sputnik Planetia on Pluto

   High resolution image of Pluto taken by New Horizons spacecraft, combined with blue, red and infrared images taken by Ralph / Multispectral Visual Imaging Camera.  The bright spread is the western lobe of the "heart" called Sputnik Planetia, which has been found to be rich in nitrogen, carbon monoxide and methane ice.

   NASA / Johns Hopkins University Applied Physics Laboratory / Southwest Research Institute

   Pluto has a density of 1.85 grams per cubic centimeter, and Charon has a density of 1.7 grams per cubic centimeter.  These values ​​indicate that both bodies contain a significant portion of the material, such as silicate rock and organic compounds, denser than water ice (at 1 gram per cubic centimeter).  The low density of charon may be due to its being more insecure or being a smaller part of the rock.  Like the icy moons of Pluto, Jupiter and Saturn, there is probably an inner rocky mass surrounded by a thick sheet of water ice.  The frozen nitrogen, carbon monoxide and methane visible on its surface are in the form of a relatively thin layer, similar to the water layer on the surface of the earth.  Sputnik Planitia is a deep basin that may have formed as a result of an impact.  It is located on the ocean axis of Pluto.  That is, it is in the opposite direction of the four dwarf planets.  The location of Sputnik Planitia requires extra mass beneath it, and this extra mass can be from the ocean floor above the rock cover and below the mantle of water ice.

   Pluto sunset scene

   Pluto's New Horizons image shows icy mountains, flat plains, and layers of fog in the air.

   NASA / JHUAPL / SwRI

   Pluto's moon

   Pluto has five well-known moons.  Charon, the largest ever, is about half the size of Pluto.  It revolves around Pluto - more precisely, the two objects revolve around a common center - at a distance of about 19,640 kilometers (12,200 miles), approximately equal to eight Pluto diameters.  (In contrast, the Earth's moon is slightly more than a quarter of the size of the Earth and later about 30 times the diameter of the Earth.)  In other words, Charon is in orbit around Pluto.  As a result, Charon is visible from only one hemisphere of Pluto.  It stays in the same position on the surface of Pluto, never rises or sets (as communications satellites do in geostationary orbit above the earth; see space flight: Earth's orbit).  Also, like most moons in the solar system, Charon is in a state of harmonious rotation.  That is, it always presents the same face to Pluto.

   Pluto  Four

   Pluto and its largest moon, Charon (left), as seen by the New Horizons spacecraft.  They revolve around their center of gravity, and the four always face the same hemisphere as Pluto.  Charon also always represents the same hemisphere because it is in a state of synchronous rotation.  That is, it rotates on its axis at the same time as it orbits Pluto.

   NASA / Johns Hopkins University Applied Physics Laboratory / Southwest Research Institute

   Charon is slightly less reflective than Pluto (less albedo - about 0.25) and more neutral in color.  Its spectrum reflects the presence of water ice, which is the dominant component of the surface.  There is no indication of solid methane that is so obvious to its larger neighbor.  There are also ammonia spots in some of its influential pits on the surface of Charon.  As discussed above on the surface and in the interior, the density of four means that the moon contains substances such as silicates and organic compounds that are denser than water ice.  For additional data about Charon, see Table.

   Britannica Quiz

   Space Odyssey

   "far off".  "Specially".  "Out of this world".  You may have heard abusive gossip, but how much do you really know about space ... cadets?  Join this quiz and start your journey of planets and universe.

   Pluto's moon

   The name means distance from the center of Pluto (radius 3 km) orbital distance (cedril period; day of the earth) Tilt of the orbit Towards the equator of the planet (degree) Eccentricity of the orbit

   Four 17,536 6.387 0 0.0022

   Styx 42,000 20.2

   Nix 48,708 24.86 0.195 0.003

   Kerberos 59,000 32.1

   Hydra 64,749 38.2 0.212 0.0051

   Name Rotation Length (Earth Day) * Radius or Radial Dimension (km) Mass (1020 kg) Average Density (g / cm3)

   * Synchronization = synchronous rotation;  Rotation and orbital periods are the same.

   Charon Sync.  604 15 1.63

   Styx 10-25

   Knox 44 0.0058

   Kerberos 13–34

   Hydra 36 0.0032

   Four

   Charon, Pluto's largest moon, in a photo taken by the New Horizons spacecraft on July 11, 2015.  This picture shows the ditch, impact craters and deep North Pole.

   NASA / Johns Hopkins University Applied Physics Laboratory / Southwest Research Institute

   Pluto's other four moons - Hydra, Nix, Kerberos and Styx - are much smaller than the four.  All four are tall.  They revolve around Pluto in almost circular orbits outside of Charon's path (such as Charon) and in the same orbital plane as Charon.  Hydra's orbital radius is approximately 64,721 kilometers (40,216 miles).  Kerberos has 57,750 kilometers (35,884 miles);  Knicks has 48,690 kilometers (30,254 miles);  And Styx has 42,413 kilometers (26,354 miles).  Styx, Nix, and Kerberos are reflective like Charon, while Hydra is more reflective.

   For each orbit completed by Charon, Hydra completes about one-sixth of the orbit, Kerberos about one-fifth, Nix about one-fourth, and Styx about one-third.  This means that the orbital periods of Hydra, Kerberos, Nix, and Styx are in the ratio 6: 5: 4: 3.  These relations of orbital periods, which are in proportion to almost small whole numbers, suggest that Hydra, Nix, Kerbrus, and Styx are all four and in stable dynamic resonance with each other.  That is, the five bodies pass through each other from time to time, communicating through gravity in a way that maintains the regularity of their competition.  Due to the ever-changing gravitational field of Pluto and Charon (which revolve around each other), the Knicks and Hydra sometimes rotate their poles in rotation.  Unlike other satellites in the solar system, Pluto's four small moons are not in rotation with the planet.  That is, the duration of their rotation is not equal to their orbital period.  The rotation period ranges from 0.4295 days for Hydra to 5.31 days for Kerberos.

   Pluto  Charon Knox;  Hydra

   Pluto and its three moons; Charon, Nix and Hydra - as observed by the Hubble Space Telescope.

   HST Pluto Companion Search / ESA / NASA

   Discovery of Pluto and its moon

   When Pluto was discovered, it was thought to be the third planet discovered after Uranus and Neptune, in contrast to the six planets that have been visible in the sky with the naked eye since ancient times.  The existence of the ninth planet was assumed based on the apparent turbulence of Uranus' orbital motion in the late 19th century, which suggested that a distant body was disturbing it by gravity.  Astronomers later found the disturbances to be ridiculous - the small-scale gravitational pull of Pluto was not strong enough to cause a suspected disturbance.  Thus the discovery of Pluto was an extraordinary coincidence that was attributed to careful observations rather than accurate predictions of the existence of a fictitious planet.

   The search for the anticipated planet was most actively supported in the early 20th century at the Lowell Observatory in Flagstaff, Arizona, USA.  It was started by the founder of the observatory, Percival Lowell, an American astronomer who gained notoriety for his famous claims of canal view on Mars.  After two failed attempts to find the planet before Lewell's death in 1916, an astronomical camera specially designed for this purpose, capable of collecting light from a vast expanse of sky, was put into service in 1929.  Was introduced, and a young amateur astronomer, Clyde Tombo, was placed to search.  On February 18, 1930, less than a year after his work began, Tombao found Pluto in the Gemini Bridge.  The object appeared as a faint "star" of the 15th magnitude, which gradually changed its position against the fixed background stars, following its 248-year orbit around the Sun.  Although Lowell and other astronomers predicted that the unknown planet would be much larger and brighter than the object found in Tombaugh, Pluto was soon accepted as the expected ninth planet.  The symbol he invented for this is ♇, for the first two letters of Pluto and for both the beginnings of Percival Lowell.

   Charon was discovered in 1978 on photographs of Pluto, less than 6 kilometers (3.7 miles) from the site of Pluto's discovery, recorded by the Flag Staff at the US Naval Observatory Station.  These images were recorded by James W. Christie and Robert S. Herrington in an attempt to obtain a more accurate measurement of Pluto's orbit.  The new satellite is named after the boatman in Greek mythology who takes dead souls to the realm of Hades in the underworld.

   One of Pluto's four moon discoveries, taken in 1978 at the US Naval Observatory Station in Flagstaff, Arizona.  Charon appears only as a bulge in the upper right of Pluto's slate.

   Official photo of the US Navy

   Prior to Charon's discovery, Pluto was thought to be larger and larger than reality.  There was no way to determine the quantity directly.  Even in the discovered images, Charon appears as an unresolved collision on the edge of Pluto, due to the relative proximity of the two bodies, their extreme distance from Earth, and the distorting effects of the Earth's atmosphere.  Indicates observation difficulties that arise.  Only near the end of the 20th century, with the availability of the Hubble Space Telescope (HST) and ground-based instruments to compensate for the environmental turbulence, equipped with optical optics, astronomers first discovered Pluto and four.  Solved in separate bodies.

   Pluto  Four

   Pluto (center) and quadrupeds (bottom left), as observed by the European Space Agency's Fant object camera mounted on the Hubble Space Telescope.

   From the National Aeronautics and Space Administration / European Space Agency

   A team of neo-astronomers working in the United States discovered two small moons, Hydra and Nix, in short images taken with the Hubble Space Telescope in 2005, which traveled a short distance of 25 km (16 miles) around Pluto.  Searching for items to do.  To confirm the orbits, astronomers examined Hubble images of Pluto and Charon made in 2002 to study surface mapping, and two faint but definite objects moving along orbital paths calculated from 2005 images.  Get hints

   In 2011, six astronomers discovered the small moon Kerberos in images taken with HST.  As with the discovery of Nix and Hydra, astronomers examined early Hubble images and found faint traces of Kerberos in images from 2006 and 2010.  HST was re-used in 2012 to search for Styx.

BLACK HOLE

   black holes

  By their very nature, black holes are black.  This is the first image of a black hole since April 2019.  Light forms a bright circle that rotates around a black hole under intense gravity, which is 6.5 billion times wider than our Sun.  This black hole is at the center of the galaxy M87, 55 million light years from Earth.  Photo courtesy of Event Horizon Telescope.

  What are black holes?

  Black holes have such strong gravity that nothing, not even light, can escape them.  That's why black holes are black.  We cannot see them directly.  But we can see how black holes affect the space around them.  Black holes can be as large as millions or billions of stars.  Or they could be as small as a few stellar masses that are crushed at high densities during supernova explosions.  And last year we learned that there are intermediate mass black holes.  In addition, there may be micro-black holes.

  2022 lunar calendars are still available.  Place your order before they leave!

  Sponsored by Chegg StudyⓇ

  Study time, crunch time, anytime.

  Get access to over 55 million textbook solutions and phased walkthroughs in addition to expert quizzes.

  learn more

  From theory to reality

  In his general theory of relativity since 1915, Albert Einstein was the first to suggest that our universe consists of such strange, dense, massive objects.  As a natural consequence of massive star deaths and falls, black holes emerge from Einstein's general relativity equation.  In 1916, German mathematician Carl Schwarzschild was the first to mathematically create black holes.  Theoretical physicist John Wheeler first named the black hole many years later, in 1967.

  Until the 1970s, black holes were only mathematical curiosity.  Then, in 1971, scientists discovered the first physical black hole, the Cygnux X-1.

  Stellar massive black holes

  We know of three types of black holes.  The first is the so-called stellar mass black hole.  These are the remnants of huge stars.  When, at the end of its life, a star about five times the mass of our Sun explodes as a supernova, gravity suddenly and violently compresses its center.

  Depending on the mass of the star, it could stop falling and become a neutron star.  But if its mass is sufficient, the core will continue to break, forming a black hole.  Stellar mass black holes range from at least five times the mass of our Sun to about 60 times the mass of the Sun.  They are usually between 10 and 30 miles (16-48 km) in diameter.

  Artist's concept of Science X-1.  Astronomers believe that Cygnus X-1 is a typical stellar black hole in the binary star system.  Cygnus X-1 was once a star before falling into a black hole.  The reason we can detect a black hole is that it is its companion, a blue supergiant variable star named HDE 226868.  Image via ESA / Wikimedia Commons.

  Medium black holes

  Scientists have announced the discovery of a medium-sized black hole in 2021.  This type of black hole bridges the gap between small, large star-shaped black holes and supermassive black holes hidden in the center of galaxies.  The newly discovered "Gold Locks" black hole has a volume of 55,000 suns.  Astronomers have discovered the middle black hole by locating something far behind it: a gamma-ray signal.  The gravitational lens of the burst emission sent scientists into a medium-sized black hole.

  Intermediate mass black holes, larger than those formed by individual stars - but smaller than the supermassive at the centers of galaxies - should theoretically exist.  Astronomers say they have discovered a gamma-ray burst that has been lensed by a black hole in terms of gravity.  In this diagram, the gamma ray burst is shown on the right.  At the center, a large black hole is acting as a beam of light emitted by gamma rays.  Photo by Carl Knox / Oz Grow / University of Melbourne.

  Massive black holes

  The third type of black hole is the supermassive black hole.  They can contain billions of suns.  Astronomers believe that most galaxies have large black holes at their centers.  At the center of our own Milky Way galaxy, Sagittarius A *, is about 4 million times the mass of our Sun and has a diameter of about 37 million miles.

  Another example of a supermassive black hole is in the center of the quasar called TON 618.  Its central black hole is estimated to be 66 billion solar masses.  Huge black holes could have formed from large collapsing clouds of interstellar hydrogen in the early history of the universe, although their origins are not clear and this is an area of ​​very active research.  They may also have accumulated extra mass on Evans by merging with other black holes.

  The artist's imagination represents the atmosphere of a large black hole in the heart of many galaxies.  The black hole is surrounded by a magnificent action disc of very hot, falling material and dusty torus (donut-shaped ring).  Black hole poles often carry high-speed jets of material that can travel very long distances in space.  Image via ESO / Wikimedia Commons.

  The fourth type of black hole

  There could be another type of black hole, a micro black hole.  These stars will be smaller in size than black holes.  So far, they are still fictitious, and no one's existence has been proven.

  What's inside a black hole?

  By definition, we cannot observe what is inside a black hole, because no light - no information of any kind - can escape.  But astronomical theories suggest that, at the center of a black hole, the mass of all black holes is concentrated in a small point of infinite density.  This point is known as unity.

  This is the point - this uniformity - that creates the incredibly strong gravitational field of the black hole.  Note, however, that uniformity does not exist.  This is because all known physics breaks down in extreme conditions at the center of a black hole, where quantum effects undoubtedly play a large part.  Since we do not yet have a quantum theory of gravity, it is impossible to say what is actually at the center of the black hole.

  Black hole boundaries

  The extent of the black hole is its event horizon.  This is not a physical edge.  It is just a point in space beyond which it is impossible to escape the gravity of the black hole.  Once anything falling into a black hole passes through the horizon of the event, it can never leave the black hole again.  It inevitably and inevitably pulls towards the center of the black hole.  Within the event horizon, any solid object explodes under intense gravity and its component is reduced to subatomic particles.  On the horizon of the event, the speed of escape of the black hole reaches the speed of light.

  Observation of black holes

  Without emissions from black holes, scientists can only observe the effects of their gravity on nearby objects in space.  If there are stars or gases near the black hole, it is actively "feeding" them.  That is, a black hole can pull material from nearby objects.  In that case, there would be an action disk in the black hole.  This is where the matter moves inward before the black hole eats it, like water in a drain.  The action disk can rotate at a significant percentage of the speed of light: friction between the particles colliding in the disk raises its temperature to millions of degrees, which produces large amounts of X-rays which can be detected by special binoculars.  Is.

  In April 2019, the Event Horizon Telescope Project revealed for the first time a live image of a black hole, the supermassive black hole at the center of the giant elliptical galaxy M87.  A global array of radio telescopes captured the image.  This undoubtedly shows that there are black holes.  Scientists were able to directly test the general relativity models of the black hole's behavior and found that the M87's black hole is very accurate.

  Picture of the Hubble Space Telescope, a jet-powered jet from the center of the Galaxy M87.  The jet consists of electrons and other subatomic particles that travel at approximately the speed of light.  Photo by Hubble Heritage Team (STScI / AURA) / NASA / ESA / esahubble.org.

   A black hole is an area of ​​space in which the field of gravity is so strong that nothing, even light, can escape it.  Black holes come in three sizes, possibly four.

FOOD

 Food is any substance that is used to nourish an organism.  Food is usually made from plants, animals, or fungi, and contains essential nutrients, such as carbohydrates, fats, proteins, vitamins, or minerals.  Matter is eaten by an organism and is absorbed by the cells of the organism to provide energy, sustain life, or stimulate growth.  Different species of animals have different eating behaviors that meet their unique metabolism requirements, which are often designed to fill a specific ecological space within a specific geographical context.

     Display of different foods

     Omnivorous humans are highly adaptable and have adapted to food in many different ecosystems.  Historically, humans have received food in two main ways: hunting and gathering, and agriculture.  As agricultural technology progressed, humans adopted an agricultural lifestyle with food according to the geographical opportunities in their geography.  Geographical and cultural differences have led to the creation of many foods and cuisines, including a wide range of ingredients, herbs, spices, techniques and dishes.  As cultures have merged through forces such as international trade and globalization, ingredients have become more widely available than their geographical and cultural origins, leading to a cosmopolitan exchange of different food traditions and practices.

     Today, much of the food energy needed by the world's ever-growing population is supplied through the industrial food industry, which produces food with extreme agriculture and distributes it through complex food processing and food distribution systems.  ۔  This conventional agricultural system relies heavily on fossil fuels, which means that food and agricultural systems are one of the major contributors to climate change, accounting for 37% of total greenhouse gas emissions.  [1] The carbon footprint of the food system and food waste are important measures to mitigate the global response to climate change.

     The food system has significant effects on a wide range of other social and political issues, including: sustainability, biodiversity, economics, population growth, water supply, and access to food.  The right to food is a human right derived from the International Covenant on Economic, Social and Cultural Rights (ICESCR), which includes "the right to a decent standard of living, including adequate food" as well as the "fundamental right to liberty".  Has been recognized.  "Because of these fundamental rights to hunger, food security is often a priority international policy activity. For example, Sustainable Development Goal 2" Zero Hunger "aims to end hunger by 2030. Food Safety and Food Security  Supervised by international agencies such as the International Association for Food Protection, the World Resource Institute, the World Food Program, the Food and Agriculture Organization, and the International Food Information Council.  And Drug Administration.

     Definition and rating

     Food sources

     Classification and food types

     Taste perception

     Original article: Taste

     Animals, especially humans, have five different tastes: sweet, sour, salty, bitter and imami.  As animals have evolved, the flavors that provide the most energy (sugar and fat) are most pleasant to eat while others, such as bitter ones, do not enjoy. [84]  It is important for survival, it has no taste.  On the other hand, fats, especially saturated fats, are thick and rich and are therefore considered more palatable.

     sweet

     Structure of sucrose

     Commonly known as the sweetest taste, sweetness is almost always caused by a type of simple sugar such as glucose or fructose, or disaccharides such as sucrose, a molecule that combines glucose and fructose. [86]  Complex carbohydrates are long chains and thus do not taste sweet.  Artificial sweeteners such as sucrose are used to mimic sugar molecules, creating a sweet feeling without calories.  Other types of sugar include raw sugar, which is known for its amber color because it is unprocessed.  As sugar is essential for energy and survival, sugar tastes good.

     The stevia plant contains a compound called steviol which, when extracted, is 300 times sweeter than sugar and has a minimal effect on blood sugar. [87]

     Sour

     Sourness is caused by the taste of acid, such as vinegar in alcoholic beverages.  Sour foods include lemons, especially lemons, lime and, to a lesser extent, oranges.  Sour is important for evolution because it symbolizes a food that can be spoiled by bacteria. [88] However, many foods are slightly acidic, and help stimulate taste buds and enhance flavor.  Do

     Salty

     Salt dunes in Bolivia

     Salinity is the taste of alkali metal ions such as sodium and potassium.  It is found in almost every food in moderate amounts to enhance the taste, although eating pure salt is considered extremely unpleasant.  There are many different types of salt, each with varying degrees of salinity, including sea salt, fluoride salt, kosher salt, mining salt, and gray salt.  In addition to enhancing the taste, it is important that the body needs and maintains a delicate electrolyte balance, which is the function of the kidneys.  Salt can be iodized, meaning it contains iodine, an essential nutrient that promotes thyroid function.  Some canned foods, especially soups or packaged soups, have high salt content to keep food safe for longer.  Historically, salt has long been used as a preservative for meat, as it promotes water excretion.  Similarly, dry foods also promote food safety.

     Bitter

     Bitterness is a feeling that is often considered unpleasant, characterized by a sharp, pungent taste.  Without sweet chocolate, caffeine, lemon peel and some fruits are bitter.

     امامی

     This section is an excerpt from Imami.

     امامی

     Soy sauce, ripe tomatoes, and muesli are examples of foods rich in ingredients.

     Imami (/ uːˈmɑːmi / from Japanese: Japanese pronunciation: [ɯmami]), or flavor, is one of the five basic flavors.  It has been described as delicious and is characteristic of broths and cooked meats

     People taste amaranth through taste receptors that typically respond to glutamate and nucleotides, which are abundant in meat broths and fermented products.  Glutamate is usually added to some foods in the form of monosodium glutamate (MSG), and nucleotides are usually added in the form of inosine monophosphate (IMP) or guanosine monophosphate (GMP).  Because imams have their own receptors, rather than originating from a combination of traditionally recognized flavors, scientists now consider imams to be a distinct flavor.

     Foods with strong amami flavors include meat, shellfish, fish (including fish sauce and preserved fish such as Maldivian fish, sardines and anchovies), tomatoes, mushrooms, hydrolyzed vegetable protein, meat liqueur, yeast liqueur, cheese  And soy sauce.  .

HUMAN EYE

 Human eye

  The human eye, in humans, is the specialized sensory organ capable of receiving visual images, which are then transmitted to the brain.

  Cross section of human eye

  The eye is protected from mechanical injury by being enclosed in a socket, or orbit, which forms a four-sided pyramid with several bone parts of the skull, the top of which points to the head.  Thus, the floor of the orbit is made up of parts of the maxilla, zygomatic and palatine bones, while the roof is made of the orbital plate of the frontal bone and behind it, the short arm of the sphenoid.  The optic pharynx, the hole through which the optic nerve goes back to the brain and enters the orbit of the large eye, is towards the nostril.  The superior orbital fissure is a large hole through which large veins and nerves pass.  These nerves can carry non-visual sensory messages - such as pain - or they can be motor nerves that control the eye muscles.  There are other cracks and canals that carry nerves and blood vessels.  The eyeball and its active muscles are surrounded by a layer of orbital fat that acts like a cushion, allowing the eyeball to rotate smoothly around a fixed point, the center of rotation.  ۔  Protosis of the eyeballs is caused by the accumulation of fluid in the orbital fatty tissue in the exophthalmic goiter.

  Britannica Quiz

  Human organs

  How much energy does the brain use in the human body?  On average, how many times does the human heart beat per minute?  Take this quiz to strengthen your brain and speed up your pulse rate.

  Eyelids

  It is important that the front surface of the eye hair, the cornea, remains moist.  This is achieved through the lashes, which regularly wipe the surface of the tear glands and other glandular secretions during waking hours and which cover the eyes during sleep and prevent evaporation.  The reflex action of the eyelids in the lids has the added function of preventing injuries from foreign bodies.  The lids are basically layers of tissue that cover the front of the orbit and leave an almond-shaped aperture when the eye is opened.  Almond points are called canthi.  Near the nose is the inner canthus, and the other is the outer canthus.  The lid can be divided into four layers: (1) the skin, which contains glands that open at the marginal surface of the lid, and the eyelids;  (2) A layer of muscle consisting primarily of the orbicularis oculi muscle, which is responsible for closing the lid.  (3) A fibrous layer that gives the lid mechanical stability, its main parts are the tarsal plates, which are directly attached to the opening between the lids, called palpebral aperture.  And (4) the innermost layer of the lid, a part of the conjunctiva.  The conjunctiva is a viscous membrane that connects the eyeball to the orbit and the lids, but allows the eyeball to rotate considerably in orbit.

  Eyelash

  Upper and lower eyelids.

  Isra SU

  conjunctiva

  Conjunctivitis lines the lids and then bends back to the surface of the hair follicles, forming an outer covering on the front of it and ending at the transparent area of ​​the eye, the cornea.  The part that lines the lids is called the palpebral part of the conjunctiva.  The part that covers the whites of the eye's hair is called the bulbar conjunctiva.  Between the bulbar and the palpebral conjunctiva are two loose, spare parts that return to the equator of the world.  These holidays are called upper and lower forensics, or conjunctival sacs.  It is the looseness of the conjunctiva in these places that makes the movement of the lids and eyeballs possible.

  Fibrous layer

  The fibrous layer, which gives the lid mechanical stability, is made up of thick, and relatively stiff, tarsal plates, which appear directly on the palpebral aperture, and a thinner palpebral fascia, or sheet of connective tissue;  Together they are called septum orbitals.  When the lids are closed, the entire septum is covered by this septum.  The two ligaments, the medial and lateral palpebral ligaments, connected to the orbit of the orbit and the septum, strengthen the position of the lids in relation to the globe.  The medial ligament is still strong.

  The muscles of the lids

  Closure of the lids is achieved by contraction of the orbicularis muscle, a single elliptical sheet of muscle extending from the forehead and facial areas and into the lids around the orbit.  It is divided into orbital and palpebral parts, and it is mainly the palpebral part, inside the lid, which causes the lid to close.  The palpebral portion passes through the lids through a ligament called the medial palpebral ligament and forms a band of fibers in a series of hemispheres to the neighboring bone of the orbit that meet outside the outer corner of the eye, the lateral kineths.  raphe.  The extra parts of the orbicularis are given different names - Horner's muscle and Revlon's muscle;  They come in close contact with the tear gas and help to drain the tears.  Revolving muscles, lying close to the edge of the lid, help keep the lids close.  The orbital part of the orbicularis is not usually associated with the eyelid, which can be done entirely through the palpebral part.  However, it has to do with closing the eyes tightly.  The skin of the forehead, temples and cheeks is then pulled towards the middle of the orbit (nose), and the rays produced by this process of the orbital part, eventually lead to the so-called well feet of the elderly.  .  It should be noted that both parts can be activated freely.  In this way, the orbital part can shrink, causing wrinkles in the eyebrows, which reduces the amount of light coming from above, while the palpebral part is relaxed and the eyes are left open.

  Opening of the eye is not only the result of inactive relaxation of the muscles of the orbicularis but also the effect of contraction of the levator palpebrae superioris muscles of the upper lid.  This muscle begins with the extravascular muscle at the top of the orbit as a narrow tendon and progresses to the upper lid as a wide tendon, the levator aponeurosis, which attaches to the anterior surface of the tarsus and covers the upper.  Skin  Lid.  Muscle contraction causes elevation of the upper eyelid.  The nerve connections to this muscle are closely related to the extracular muscles needed to lift the eye, so when the eye looks upwards, the upper eyelid converges and rises.

  The orbicularis and levator are striped muscles in voluntary control.  The lids also contain smooth (involuntary) muscle fibers that are activated by the sympathetic distribution of the autonomic system and widen the pelvic fissure (opening of the eye) by the height of the upper and the depression of the lower lid.

  In addition to the muscles described earlier, other facial muscles often assist in the process of closing or opening the lid.  Thus, the muscles of the corrugator supercilii pull the eyebrows towards the bridge of the nose, creating a characteristic trench in the forehead, forming a "roof" at the middle angle of the eye.  The roof is mainly used to protect the eye from sunlight.  The pyramid, or processor, muscles occupy the bridge of the nose.  They originate in the lower part of the nasal bones and are attached to the skin of the lower part of the forehead on either side of the midline.  They pull the skin into translucent skins.  When the lid is opened, the frontalis muscle rises high on the forehead, between the coronal sutures, a suture in the upper part of the skull, and the orbital border is attached to the skin of the eyebrows.  The contraction therefore causes the eyebrows to be raised and resists the action of the orbital part of the orbicularis.  Muscles are used especially when one looks upwards.  It is also practiced when vision is presented with difficulty either due to distance or lack of sufficient light.

  Quick

  The outermost layer of the lid is the skin, the characteristics of which are not very different from the skin of the rest of the body, with the possible exception of the large pigment cells, which, although found elsewhere, are very much in the skin of the lid.  Are  Cells can wander, and these are the movements of pigment cells that determine color changes in some people as health changes.  The skin contains sweat glands and hair.  As the connection between the skin and the conjunctiva develops, the hair changes its character and becomes mahram.

  Glandular device

  Moisture from the tear glands (tear glands) keeps the eye moist.  These almond-shaped glands extend inward from the outer corner of each eye under the upper lid.  Each gland has two parts.  One part of the eye socket is in a shallow depression formed by the frontal bone.  The second part projects into the back of the upper lid.  The ducts that come out of each gland, in numbers three to 12, open into the superior conjunctival pharynx, or sac.  From the pharynx, tears flow across the eye and into the pancreatic lacrimal, with small holes in the margins of each eyelid near the inner corner.  Pentacles have holes in the tear ducts.  They carry tears to the sacs, the wide upper end of the nasolabial ducts, which carry the tears to the nose.

  When tears vapor flow into the eye, the secretion of oil and mucus through other glands is largely prevented.  Thus, the meibomian, or tarsal gland, consists of a series of long glands that spread through the tarsal plates.  They release an oil that rises to the surface of the margin of the lid and acts as a barrier to tear fluid, which accumulates in the ducts between the eye hair and the lid barrier.

त्वचा

 शरीर के सबसे बड़े अंग के रूप में, त्वचा कीटाणुओं से रक्षा करती है, शरीर के तापमान को नियंत्रित करती है और स्पर्श की भावना को सक्षम बनाती है।  त्वचा की प्रमुख परतों में एपिडर्मिस, डर्मिस और हाइपोडर्मिस शामिल हैं और त्वचा कैंसर, मुँहासे, झुर्रियाँ और पिंपल्स सहित कई समस्याओं से ग्रस्त हैं।

  एनाटॉमी की स्थिति और विकार देखभाल के बारे में अक्सर पूछे जाने वाले प्रश्न

  अवलोकन

  पेशीय ऊतक के ऊपरी भाग पर त्वचा की तीन परतें।

  त्वचा क्या है?

  त्वचा शरीर का सबसे बड़ा अंग है, जो पानी, प्रोटीन, वसा और खनिजों से बना होता है।  आपकी त्वचा आपके शरीर को कीटाणुओं से बचाती है और शरीर के तापमान को नियंत्रित करती है।  त्वचा की नसें आपको गर्म और ठंडा महसूस करने में मदद करती हैं।

  आपकी त्वचा, आपके बालों, नाखूनों, तेल ग्रंथियों और पसीने की ग्रंथियों के साथ, एंटीगमेंटरी (इन-टीईजी-यू-एमईआईएनटी-ए-री) प्रणाली का हिस्सा है।  "एंटीगोमेट्री" का अर्थ है शरीर का बाहरी आवरण।

  क्लीवलैंड क्लिनिक एक गैर-लाभकारी शैक्षिक चिकित्सा केंद्र है।  हमारी साइट पर विज्ञापन हमारे मिशन में योगदान करते हैं।  हम गैर-क्लीवलैंड क्लिनिक उत्पादों या सेवाओं का समर्थन नहीं करते हैं।  नीति

  शरीर रचना

  त्वचा की परतें क्या हैं?

  त्वचा ऊतक की तीन परतों से बनी होती है:

  एपिडर्मिस, ऊपरी परत।

  ड्रम, मध्य परत।

  हाइपोडर्म, नीचे या वसा की परत।

  एपिडर्मिस (त्वचा की ऊपरी परत) क्या करती है?

  आपका एपिडर्मिस त्वचा की ऊपरी परत है जिसे आप देख और छू सकते हैं।  त्वचा कोशिकाओं के अंदर एक प्रोटीन केराटिन, त्वचा कोशिकाओं का निर्माण करता है और इस परत को बनाने के लिए अन्य प्रोटीनों के साथ मिलकर बनता है।

  एक सुरक्षात्मक बाधा के रूप में कार्य करता है: एपिडर्मिस बैक्टीरिया और कीटाणुओं को आपके शरीर और रक्तप्रवाह में प्रवेश करने से रोकता है और संक्रमण का कारण बनता है।  यह बारिश, धूप और अन्य तत्वों से भी बचाता है।

  नई त्वचा बनाता है: एपिडर्मिस लगातार नई त्वचा कोशिकाओं का निर्माण करता है।  ये नई कोशिकाएं लगभग 40,000 पुरानी त्वचा कोशिकाओं की जगह लेती हैं जिन्हें आपका शरीर हर दिन बहाता है।  आपको हर 30 दिन में नई त्वचा मिलती है।

  आपके शरीर की रक्षा करता है: एपिडर्मिस में लैंगरहैंस कोशिकाएं शरीर की प्रतिरक्षा प्रणाली का हिस्सा होती हैं।  वे कीटाणुओं और संक्रमणों से लड़ने में मदद करते हैं।

  त्वचा का रंग प्रदान करता है: एपिडर्मिस में मेलेनिन होता है, वर्णक जो त्वचा को रंग देता है।  आपके पास मेलेनिन की मात्रा आपकी त्वचा, बालों और आंखों का रंग निर्धारित करती है।  जो लोग अधिक मेलेनिन बनाते हैं उनकी त्वचा का रंग गहरा होता है और वे तेजी से तन बन सकते हैं।

  ड्रम (त्वचा की मध्य परत) क्या करते हैं?

  ड्रम त्वचा की मोटाई का 90% हिस्सा बनाते हैं।  त्वचा की यह मध्य परत:

  कोलेजन और इलास्टिन होते हैं: कोलेजन एक प्रोटीन है जो त्वचा की कोशिकाओं को मजबूत और लोचदार बनाता है।  डर्मिस में पाया जाने वाला एक अन्य प्रोटीन इलास्टिन त्वचा को कोमल रखता है।  यह त्वचा को अपना आकार वापस पाने में भी मदद करता है।

  बाल बढ़ते हैं: बालों के रोम की जड़ें डर्मिस से जुड़ी होती हैं।

  आपको संपर्क में रखता है: ड्रम में नसें आपको बताती हैं कि कब कुछ बहुत गर्म, खुजलीदार या स्पर्श करने के लिए बहुत नरम है।  ये तंत्रिका रिसेप्टर्स आपको दर्द महसूस करने में भी मदद करते हैं।

  तेल बनाता है: त्वचा में तेल ग्रंथियां त्वचा को मुलायम और चिकनी रखने में मदद करती हैं।  जब आप तैरते हैं या बारिश की आंधी में फंस जाते हैं तो तेल आपकी त्वचा को बहुत अधिक पानी सोखने से रोकता है।

  पसीना पैदा करता है: डर्मिस में पसीने की ग्रंथियां त्वचा के छिद्रों के माध्यम से पसीने का स्राव करती हैं।  पसीना आपके शरीर के तापमान को नियंत्रित करने में मदद करता है।

  रक्त की आपूर्ति: त्वचा में रक्त वाहिकाएं त्वचा की परतों को स्वस्थ रखकर एपिडर्मिस को पोषक तत्व प्रदान करती हैं।

  हाइपोडर्मिस क्या करता है?

  त्वचा की निचली परत, या हाइपोडर्म, वसायुक्त परत होती है।  हाइपोडर्मिस:

  मांसपेशियों और हड्डियों को कुशनिंग: हाइपोडर्मिस में वसा मांसपेशियों और हड्डियों को गिरने या दुर्घटना होने पर चोट से बचाता है।

  जुड़ा ऊतक: यह ऊतक त्वचा की परतों को मांसपेशियों और हड्डियों से जोड़ता है।

  नसों और रक्त वाहिकाओं में मदद करता है: डर्मिस (मध्य परत) में नसें और रक्त वाहिकाएं हाइपोडर्मिस में बढ़ जाती हैं।  हाइपोडर्मिस को शरीर के बाकी हिस्सों से जोड़ने के लिए ये नसें और रक्त वाहिकाएं शाखा करती हैं।

  शरीर के तापमान को नियंत्रित करता है: हाइपोडर्मिस में वसा आपको ज़्यादा गरम या ज़्यादा गरम होने से रोकता है।

  त्वचा को और क्या बनाता है?

  आपकी त्वचा के एक इंच में लगभग 19 मिलियन त्वचा कोशिकाएं और 60,000 मेलानोसाइट्स (कोशिकाएं जो मेलेनिन या त्वचा वर्णक बनाती हैं) होती हैं।  इसमें 1000 तंत्रिका अंत और 20 रक्त वाहिकाएं भी शामिल हैं।

  शर्तें और विकार

  कौन सी स्थितियां और विकार त्वचा को प्रभावित करते हैं?

  शरीर की बाहरी रक्षा प्रणाली के रूप में, आपकी त्वचा को विभिन्न समस्याओं का खतरा होता है।  इसमें शामिल है:

  संपर्क जिल्द की सूजन और ज़हर आइवी जैसी एलर्जी।

  फफोले

  कीड़े के काटने, जैसे मकड़ी के काटने, टिक काटने और मच्छर के काटने।

  मेलेनोमा सहित त्वचा कैंसर।

  सेल्युलाइटिस जैसे त्वचा संक्रमण।

  खुजली वाली त्वचा और शुष्क त्वचा।

  त्वचा रोग जैसे मुंहासे, एक्जिमा, सोरायसिस और विटिलिगो।

  त्वचा के घाव, जैसे तिल, झाइयां और त्वचा टैग।

  घाव, जलन (सनबर्न सहित) और निशान।

  का ख्याल रखना

  मैं अपनी त्वचा की रक्षा कैसे कर सकता हूं?

  आप उम्र के साथ कोलेजन और इलास्टिन खो देते हैं।  इससे त्वचा की बीच की परत (त्वचा) पतली हो जाती है।  नतीजतन, त्वचा ढीली और झुर्रीदार हो सकती है।

  यद्यपि आप उम्र बढ़ने की प्रक्रिया को रोक नहीं सकते हैं, ये क्रियाएं स्वस्थ त्वचा को बनाए रखने में मदद कर सकती हैं:

  हर दिन सनस्क्रीन लगाएं (भले ही आप ज्यादातर घर के अंदर हों)।  कम से कम 30 ब्रॉड स्पेक्ट्रम सनस्क्रीन फैक्टर (SPF) वाला सनस्क्रीन चुनें।

  घर के अंदर या बाहर टैन न करें।  टैनिंग त्वचा को नुकसान पहुंचाती है।  यह त्वचा के जीवन को लम्बा खींचता है और त्वचा कैंसर का कारण बन सकता है।

  तनाव से निपटने के स्वस्थ तरीके खोजें।  तनाव त्वचा की कुछ स्थितियों को बदतर बना सकता है।

  त्वचा कैंसर के संकेत हो सकने वाले परिवर्तनों को देखने के लिए नियमित रूप से अपनी त्वचा और मस्सों की जांच करें।

  धूम्रपान छोड़ें और तंबाकू उत्पादों का सेवन करें।  सिगरेट और इलेक्ट्रॉनिक सिगरेट में निकोटीन और अन्य रसायन त्वचा की उम्र बढ़ने में तेजी लाते हैं।

  अपने चेहरे को सुबह और रात में धोने के लिए माइल्ड क्लींजर का इस्तेमाल करें।

  रूखी त्वचा से बचने के लिए नियमित रूप से नहाएं और मॉइस्चराइजिंग लोशन लगाएं।

  लगातार पूछे जाने वाले प्रश्न

  मुझे डॉक्टर से कब बात करनी चाहिए?

  यदि आपके पास अनुभव है, तो आपको अपने स्वास्थ्य सेवा प्रदाता को कॉल करना चाहिए:

  तिल के आकार, रंग, आकार या संतुलन में परिवर्तन।

  त्वचा नए तिल की तरह बदल जाती है।

  एक कट जिसे होम स्ट्रिप बंद नहीं कर सकती (जिसमें टांके लग सकते हैं)।

  गंभीर, जलते हुए छाले।

  त्वचा के संक्रमण के लक्षण जैसे लाल धारियाँ या पीला स्राव।

  अस्पष्ट त्वचा खुजली या त्वचा की स्थिति।

  क्लीवलैंड क्लिनिक से एक नोट

  शरीर के सबसे बड़े अंग के रूप में, आपकी त्वचा आपके शरीर को कीटाणुओं और तत्वों से बचाने में महत्वपूर्ण भूमिका निभाती है।  यह आपके शरीर को एक आरामदायक तापमान पर रखता है, और त्वचा के नीचे की नसें स्पर्श की भावना प्रदान करती हैं।  इस बाहरी शरीर को ढकने से त्वचा कैंसर जैसी गंभीर समस्याएं हो सकती हैं और साथ ही मुंहासे और त्वचा पर चकत्ते जैसी आम समस्याएं हो सकती हैं।  आपका स्वास्थ्य सेवा प्रदाता आपकी त्वचा को स्वस्थ रखने में मदद करने के लिए सुझाव दे सकता है।

SKIN

 Skin

  As the largest organ of the body, the skin protects against germs, regulates body temperature and enables the sense of touch.  The major layers of the skin include the epidermis, dermis and hypodermis and suffer from many problems including skin cancer, acne, wrinkles and pimples.

  Frequently Asked Questions about Anatomy Conditions and Disorder Care

  Overview

  Three layers of skin on the upper part of the muscle tissue.

  What is skin?

  The skin is the largest organ of the body, made up of water, proteins, fats and minerals.  Your skin protects your body from germs and regulates body temperature.  The nerves in the skin help you to feel hot and cold.

  Your skin, along with your hair, nails, oil glands and sweat glands, is part of the antigmentary (in-TEG-you-MEINT-a-ree) system.  "Antigometry" means the outer covering of the body.

  The Cleveland Clinic is a non-profit educational medical center.  Advertising on our site contributes to our mission.  We do not endorse non-Cleveland Clinic products or services.  Policy

  Anatomy

  What are the skin layers?

  The skin is made up of three layers of tissue:

  Epidermis, the upper layer.

  Drums, middle layer.

  Hypoderms, bottom or layer of fat.

  What does the epidermis (upper layer of skin) do?

  Your epidermis is the upper layer of skin that you can see and touch.  Keratin, a protein inside skin cells, forms skin cells and combines with other proteins to form this layer.

  Acts as a protective barrier: The epidermis prevents bacteria and germs from entering your body and bloodstream and causes infections.  It also protects from rain, sun and other elements.

  Forms new skin: The epidermis constantly builds new skin cells.  These new cells replace about 40,000 old skin cells that your body sheds every day.  You get new skin every 30 days.

  Protects Your Body: The Langerhans cells in the epidermis are part of the body's immune system.  They help fight germs and infections.

  Provides skin color: The epidermis contains melanin, the pigment that colors the skin.  The amount of melanin you have determines the color of your skin, hair and eyes.  People who make more melanin have darker skin and can become tan faster.

  What do the drums (middle layer of skin) do?

  Drums make up 90% of the skin's thickness.  This middle layer of skin:

  Contains collagen and elastin: Collagen is a protein that makes skin cells strong and elastic.  Another protein found in the dermis, elastin, keeps the skin supple.  It also helps the skin to regain its shape.

  Hair grows: The roots of the hair follicles are attached to the dermis.

  Keeps you in touch: The nerves in the drums tell you when something is too hot, itchy or too soft to touch.  These nerve receptors also help you feel pain.

  Makes oil: The oil glands in the skin help to keep the skin soft and smooth.  The oil also prevents your skin from absorbing too much water when you swim or get caught in a rainstorm.

  Produces Sweat: Sweat glands in the dermis secrete sweat through the pores of the skin.  Sweating helps regulate your body temperature.

  Blood supply: The blood vessels in the skin provide nutrients to the epidermis by keeping the skin layers healthy.

  What does the hypodermis do?

  The lower layer of skin, or hypoderms, is the fatty layer.  Hypodermis:

  Cushioning the muscles and bones: The fat in the hypodermis protects the muscles and bones from injury when you fall or have an accident.

  Connected tissue: This tissue connects the skin layers to the muscles and bones.

  Helps nerves and blood vessels: Nerves and blood vessels in the dermis (middle layer) enlarge in the hypodermis.  These nerves and blood vessels branch out to connect the hypodermis to the rest of the body.

  Regulates body temperature: The fat in the hypodermis prevents you from overheating or overheating.

  What else makes the skin?

  One inch of your skin contains approximately 19 million skin cells and 60,000 melanocytes (the cells that make melanin or skin pigment).  It also includes 1000 nerve endings and 20 blood vessels.

  Conditions and disorders

  What conditions and disorders affect the skin?

  As the body's external defense system, your skin is at risk of various problems.  These include:

  Allergies such as contact dermatitis and poison ivy.

  Blisters

  Insect bites, such as spider bites, tick bites and mosquito bites.

  Skin cancer, including melanoma.

  Skin infections such as cellulitis.

  Itchy skin and dry skin.

  Skin diseases such as acne, eczema, psoriasis and vitiligo.

  Skin lesions, such as moles, freckles and skin tags.

  Wounds, burns (including sunburn) and scars.

  take care of

  How can I protect my skin?

  You lose collagen and elastin with age.  This causes the middle layer (skin) of the skin to become thinner.  As a result, the skin may sag and wrinkle.

  Although you can't stop the aging process, these actions can help maintain healthy skin:

  Apply sunscreen every day (even if you are mostly indoors).  Choose sunscreen with at least 30 broad spectrum sunscreen factor (SPF).

  Do not tan indoors or outdoors.  Tanning damages the skin.  It prolongs the life of the skin and can cause skin cancer.

  Find healthy ways to handle stress.  Stress can make certain skin conditions worse.

  Check your skin and moles regularly to see the changes that may be a symptom of skin cancer.

  Quit smoking and use of tobacco products.  Nicotine and other chemicals in cigarettes and electronic cigarettes accelerate skin aging.

  Use a mild cleanser to wash your face in the morning and at night.

  Shower regularly and apply moisturizing lotion to prevent dry skin.

  Frequently Asked Questions

  When should I talk to a doctor?

  If you have experience, you should call your healthcare provider:

  A change in the size, color, shape or balance of a mole.

  The skin changes like a new mole.

  A cut that the home strip can't close (which can have stitches).

  Severe, burning blisters.

  Symptoms of a skin infection such as red streaks or yellow discharge.

  Unclear skin itching or skin condition.

  A note from the Cleveland Clinic

  As the largest organ of the body, your skin plays an important role in protecting your body from germs and elements.  It keeps your body at a comfortable temperature, and the nerves under the skin provide a sense of touch.  Covering this outer body can lead to serious problems like skin cancer as well as common problems like acne and skin rashes.  Your healthcare provider can offer tips to help keep your skin healthy.