light-year

ریشه

The word 'light' comes from Middle English 'light', from Old English 'lēoht', from Proto-Germanic 'leuhtaz'. The word 'year' comes from Old English 'gēar', from Proto-Germanic 'jērą'.

مثال

• The nearest star to Earth, Proxima Centauri, is about 4.24 light-years away.
• A light-year is a unit of distance used in astronomy to measure vast cosmic distances.
• The light-year is a convenient way to express the vastness of interstellar space.