天气预报 > 科学 > 一千亿光年是多久
一千亿光年是多久
更新时间: 2021-05-20 16:22:45  

光年,长度单位,指光在一年时间中行走的距离,即约九万四千六百亿公里。光年是计量天体间时空距离的单位,一般被用于衡量天体间的时空距离,其字面意思是指光在真空中沿直线传播一年的距离。一亿光年就是每秒30万公里的光速行走一亿年的距离!想想看,这是一个多么令人难以想象的遥远距离啊。

关键词: 光年 多久

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