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| abstraction > mathematical concept > unit > length unit > light-year | 
| light-year comparison table | ||||
| Subject | is an instance of | is a kind of | has symbol | has definition | 
|---|---|---|---|---|
| length unit | unit | |||
| light-year | length unit | ly | The distance light travels in a vacuum in 1 year. 1 lt-yr = 9.4605 × 1012 km = 0.307 pc (c = 299792.46 km s-1 = 186274 miles s-1). (1 lt-min ≈ 0.13 AU.) | 
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