a 22b
22 b
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Kepler-22b is quite a bit larger than the biggest rocky planet in this Solar System (which happens to be Earth), but much smaller than the smallest of our local gaseous worlds (Neptune).
BBC: Viewpoint: The obsession with a 'twin Earth'
We really don't know what sort of composition a planet the size of Kepler-22b would have.
To be Earthlike, you also need a sun like ours and Kepler-22b has that.
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