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A light year is a unit of:
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- Time
- Distance in Space
- Length of astronomical distances
- Distance travelled by light
- None of these
- Time
Correct Option: E
More than one option is correct. A light-year is a unit of length used informally to express astronomical distances. It is the distance that light can travel in one year which is approximately 9 trillion kilometres (or about 6 trillion miles). As defined by the International Astronomical Union (IAU),
a light-year is the distance that light travels in vacuum in one Julian year (365.25 days). Best Option: (4)
