Here are 160 billion reasons to be excited about the search for habitable planets

We used to think our planet was unique, but discoveries by planet-hunting missions like Kepler continue to indicate that the the odds of Earth being one-of-a-kind are incredibly slim. Now, findings published in today's issue of Nature suggest that there are far more planets in our galaxy that we ever imagined: »1/12/12 6:40pm1/12/12 6:40pm