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光年是什么单位?
更新时间: 2021-04-14 00:01:22  

1、光年,英文名(lightyear),是长度单位之一,指光在真空中一年时间内传播的距离,大约九兆四千六百亿公里(或5.881012英里)。

2、光年一般用在天文学中,用来量度很大的距离,如太阳系跟另一恒星的距离。

关键词: 光年 什么 单位

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