地球到月球的距离是多少平均距离是384万千米约是地球直径的30倍
直径1.28万千米,如果人类未来把地球挖穿,会发生什么?
你知道人类有多渺小?宇宙究竟浩瀚到何种地步吗?
of a 10-kilometer (6-mile) diameter asteroid striking the earth
is about percent larger than earth, with diameter of 9,200
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