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美好时光机 on MSN
6 小时
一颗“超重行星”被发现,体积是天王星70%,质量却堪比5颗天王星
在无垠而神秘的宇宙中,行星无数,比那些闪烁的恒星还要多。以我们熟知的太阳系为例,八大行星如同性格各异的守护者环绕太阳,还有无数的矮行星、小行星和卫星,数量庞大得如同沙粒。根据是否具备岩质表面,行星可分为岩质行星和气态行星两大阵营。
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