- Light-year, light year or lightyear, symbol: ly
- It is the distance the light travels during one year.
- A light-year is an unit of length.
- A light-year = exactly 9,460,730,472,580.8 km
- A light-year = about 5,878,630,000,000 miles
- A light-year = 63,241.077 astronomical units
- ↑ 1.0 1.1 1.2 1.3 1.4 http://en.wikipedia.org/wiki/Light-year
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