Cx330
ID：17587962
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Cx330
2年前
銀河系直徑巨大（大約621,000,000,000,000,000英里）。如果以光速來測量的話，大約要用10萬光年才能橫穿銀河系。
相對而言，我們地球的赤道直徑只有7926英里。
#宇宙#
念雪： 哇，宇宙真的好大啊！
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