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Oct 19, 2012 at 20:43 review Late answers
Oct 19, 2012 at 20:56
May 19, 2012 at 2:11 history edited Kevin CC BY-SA 3.0
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May 18, 2012 at 19:48 comment added Keith Thompson The Universe may or may not be infinite; the Galaxy certainly is not. Even assuming, say, a trillion M-class planets in the Galaxy (a vast overestimate), the odds against another one being that similar to Earth are beyond astronomical.
May 18, 2012 at 13:14 history answered Space Cadet CC BY-SA 3.0