Those are all measures of length.
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Yes, astronomers use light-years to measure the distance between stars in space. A light-year is the distance that light travels in one year, which is about 9.46 trillion kilometers or 5.88 trillion miles. This unit of measurement is more practical given the vast distances in space.
Betelgeuse is 640 light-years away from the Earth. 1 light-year is the distance traveled by light in 1 year. speed of light = 3 x 108 meters per second So, 1 ly = 3 x 108 x 365 x 24 x 60 x 60 = 9.46 x 1015 meters 640 light-years = 640 x 9.46 x 1015 = 6.05 x 1018 meters 1 meter = 0.621 x 10-3 miles 640 light-years = 6.05 x 1018 x 0.621 x 10-3 = 3.76 x 1015 miles That is 3,760,000,000,000,000 miles.
Light years
885 million miles = 0.000150548614 light years.
4 light years is equal to 2.35139993 × 1013 miles