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Wrong category if the "second Earth" you mean is the one a quick search found: nothing to do with speleology, but a planet orbiting a star called Gliese 581C about 20 light-years away in the constellation of Libra.

It is calculated to have a surface temperature similar to that of Earth, so amenable to life, but there the resemblance ends so far at least. The soubriquet appears to have been invented by the headline-writers of the British newspaper, The Guardian.

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12y ago

What else can I help you with?