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May 4 2012

Expectation of extraterrestrial life built more on optimism than evidence, study finds


Recent discoveries of planets similar to Earth in size and proximity to the planets' respective suns have sparked scientific and public excitement about the possibility of also finding Earth-like life on those worlds.

But Princeton University researchers have found that the expectation that life from bacteria to sentient beings has or will develop on other planets as on Earth might be based more on optimism than scientific evidence.

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