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太阳系外发现最小的行星


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这颗被称为“开普勒10b”的行星只比地球大约40%,是迄今为止在太阳系外发现的最小的行星。不仅如此,与已经发现的500多颗行星中的绝大多数相异的是,“开普勒10b”不仅仅是一颗巨大的气体或者冰体星球,他是由岩石构成,就像地球一样。

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