Because no other unit of distance is large enough. The closest star system to us is 4.2 light years away, which is about 25,000,000,000,000 miles.
light years
Light years is a measure of distance, not of time; it is the distance that light travels in one year.
One light year is the distance that light travels in one year, which is approximately 5.88 trillion miles. Therefore, to travel a distance equivalent to 2.5 Earth years, you would need to travel about 2.5 light years, which is roughly 14.7 trillion miles.
If you are asking how long it would take to travel the distance of 123.23 light years, then that would depend on how fast you are traveling. Because a light year is a measure of distance not time.
Light years aren't the best, since it is only about 0.000624 light years away. Saying that the distance is 39 AU would be better. On the other hand, it's a much better unit than saying the distance is 3,229,510,630,000 fathoms.
light years
Light years is a measure of distance, not of time; it is the distance that light travels in one year.
In spite of its name, a light year does not indicate time, but it indicates distance! It actually equates to the distance that light travels in one Earth year, which is a very big distance, seeing that light travels at 186,000 miles per second.
Light years are used to measure distance from Earth to distant stars and planets.
One light year is the distance that light travels in one year, which is approximately 5.88 trillion miles. Therefore, to travel a distance equivalent to 2.5 Earth years, you would need to travel about 2.5 light years, which is roughly 14.7 trillion miles.
A light year is a measure of distance not time. A light year is the distance light travels in one year. So for light to travel 6,300 light years, would take 6,300 years
Not really. A light year is a measure of distance. It is the distance light can travel in one earth year, about 6 trillion miles
If you are asking how long it would take to travel the distance of 123.23 light years, then that would depend on how fast you are traveling. Because a light year is a measure of distance not time.
Light years aren't the best, since it is only about 0.000624 light years away. Saying that the distance is 39 AU would be better. On the other hand, it's a much better unit than saying the distance is 3,229,510,630,000 fathoms.
Light years measure distance in astronomy. It is the distance that light travels in one year, which is about 9.46 trillion kilometers.
Light Year is unit for all astronomic distances
The distance to a star located 100 light years away from Earth is 100 light years.