Astronomy & Space
Basic

Light-Year

Distance light travels in a given time.

Formula

d=c×td = c \times t

Variables

cSpeed of light
tTime

Example

1 ly ≈ 9.46×10¹² km

Did You Know?

A light-year is about 9.46 trillion km — the nearest star beyond the Sun is over 4 of them away.

distancelightbasic