Name
- Light-year, light year or lightyear, symbol: ly[1]
Description
- It is the distance the light travels during one year.
- A light-year is an unit of length.[1]
- A light-year = exactly 9,460,730,472,580.8 km[1]
- A light-year = about 5,878,630,000,000 miles[1]
- A light-year = 63,241.077 astronomical units[1]