Word: 光年 (guāngnián) 光年 dictionary entry guāngnián light-year Full dictionary entry for 光年 Example sentences using 光年 2 sentences, showing page 1 of 1. 一光年到底有多长？ Yì guāngnián dàodǐ yǒu duō cháng? Just how long is one light-year? 这颗星星离我们有四光年远。 Zhè kē xīngxing lí wǒmen yǒu sì guāngnián yuǎn. This star is four light-years away from us.