Light Years make 🎆✨
Light years make the measurement of astronomical distances more manageable.
🎆 A light year is a measure of astronomical distance: light travels through space at a speed of 983,571,056 feet (299,792,458 meters) per second, making a light year approximately 6 trillion miles (9.7 trillion kilometers). (Image Credit: ikonacolor via Getty Images)
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How far is a light year?
Why use light years?
Alternatives to light years
A light year is a measure of distance, not of time (as the name implies). A light year is the distance covered by a beam of light in a terrestrial year, which is approximately 6 trillion miles (9.7 trillion kilometers).
On the scale of the universe, it is difficult to measure distances in miles or kilometers because there is so much talk. It is very easy for astronomers to measure the distance of stars from us in the time it takes for light to travel this vastness. For example, the closest star to our Sun, Proxima Centauri, is 4.2 light-years away, meaning that the light we see from the star takes just over four years to reach us.
How far is a light year?
The speed of light is constant throughout the universe and is known for its high accuracy. Light travels in space at a speed of 670,616,629 miles per hour (1,079,252,849 kilometers per hour). To find the distance of one light year, you multiply this speed by the number of hours (8,766) in a year. Result: One light year equals 5,878,625,370,000 miles (9.5 trillion kilometers). At first glance, this may seem like a long distance, but the vastness of the universe dwarfs this length. The diameter of the known universe is estimated to be 28 billion light years.
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Why use light years?
It is impractical to measure astronomically in miles or kilometers. Starting from our cosmic neighborhood, the nearest star-forming region to us, the Orion Nebula, appears a short 7,861,000,000,000,000 miles away, or 1,300 light-years away in light years. The center of our galaxy is about 27,000 light years away. Our nearest spiral galaxy, the Andromeda Galaxy, is 2.5 million light years away. Some of the most distant galaxies we can see are billions of light years away. Galaxy GN-z11 is considered to be the most recognizable galaxy at a distance of 13.4 billion light years from Earth.
Like degrees, light years can also be divided into smaller units of light times, light minutes, or light seconds. For example, the sun is more than 8 light minutes away from the earth, while the moon is only one light second away. Scientists use these terms when talking about communication with deep space satellites or rovers. Due to the limited speed of light, it may take more than 20 minutes for the Curiosity rover to send a signal to Mars.
Measurements in light years also allow astronomers to determine how far back in time they are looking. Because it takes time for light to reach our eyes, everything we see in the night sky is gone. In other words, when you observe an object 1 light-year away, you see it as it did a year ago. We see the Andromeda Galaxy as it appeared 2.5 million years ago. The farthest thing we can see is the background of the cosmic microwave, our oldest view of the universe, which occurred approximately 13.8 billion years after the Big Bang.
This simulation shows how small the Milky Way galaxy will look at ULAS J0744 + 25 at a distance of about 775,000 light years. (Image Credit: Isolation Software: Uniview by SCISS Data: SOHO (ESA & NASA), John Buchansky (Haverford College) and Jackie Faherty (American Museum of Natural History and Carnegie Institution Department of Ground Magnetism)
❇ Light year alternatives
Astronomers also use Parsex as an alternative to the light year. Parallax, short for seconds, comes from the use of a triangle to determine the distance of a parsic star. To be more specific, this is the distance of a star whose apparent position in the sky after 1 arc second (1 / 3,600 degrees) the earth revolves around the sun. One arc second equals 3.26 light years.
Whether it's the light years or the Parsex, astronomers will continue to use both to measure distances in our vast and vast universe.
Additional resources:
Astronomer Paul Sutter's "We Don't Planet" is a cosmic distance ladder.
Learn more from the International Astronomical Union about how astronomers measure the universe.
See "Powers of Ten" (1977), which provides insights into the size of the universe.
Join our space forums to keep up to date on the latest missions, Night Sky and more! And if you have any news tips, corrections or comments, let us know:
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