EPISODE · Sep 10, 2019 · 4 MIN
水星知多少？
from 天文随心听｜讲述宇宙与人的故事
离太阳最近的行星是水星，在离太阳大约5千7百万千米远的地方绕着太阳公转。它也是太阳系中最小的行星，直径4879千米。水星的名字是根据罗马的商业之神命名的，相当于希腊的神之信使赫尔墨斯。
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