No second chance ...

... Book Review: Alone in the Universe - WSJ.com.

...  there is a world of difference between habitable planets and inhabited planets. Mr. Gribbin's narrative reduces the vision of Disney's documentary into the counterfactual fever-dream it really is. The author's conclusion: Earth is the sole abode of intelligent life in the galaxy, the product of a profoundly improbable sequence of cosmic, geologic and climatic events—some thoroughly documented, some inferable from fragmentary evidence—that allowed our planet to become a unique refuge where life could develop to its full potential.