Astronomers worldwide agree: there's a heck of a lot of planets out there. Thanks to tools like the Kepler Space Telescope, scientists have been discovering hundreds of new planets each year, and many believe it's only a matter of time until we find one very similar to our own earth. The big question now is, just how common are planets, and how many of them can we expect to look like Earth—or least hold liquid water?
In new study, researchers led by Steffen Jacobsen at the Niels Bohr Institute in Denmark have taken a crack at these questions and come up with some pretty stunning conclusions. By extrapolating on recent planet discoveries found though the Kepler mission, the astronomers have estimated that, on ave...
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