What is a light-year? - NASA Science
What is a light-year? - NASA Science
Mar 5, 2020
nasa.gov
The light-year is a unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometres or 5.88 trillion miles. As defined by the International Astronomical Union, a light-year is the distance that light travels in vacuum in one Julian year. | Science Of The Universe
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