EPISODE · Aug 5, 2019 · 5 MIN
光年是一种长度单位，那么1光年有多远？
from 天文随心听｜讲述宇宙与人的故事
首先你需要了解光年是个长度单位而不是什么所谓的时间单位，1光年也就是光一年内传播的距离，光的速度在真空中每秒大约30万千米，1年约等于3000万秒，由此可以算出1光年约等于9万亿千米。
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光年是一种长度单位，那么1光年有多远？
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