NASA's Kepler Space Telescope has been hunting the cosmos for exoplanets since March of 2009. In its nearly five years of searching the stars, it has found thousands of possible candidates. Scientists recently verified the thousandth planet Kepler had found, and even more exciting, they announced that Kepler had found three more Earth-like planets.
Those three planets bring Kepler's Earth-like planet count to a total of eight. In order to qualify as "Earth-like," these exoplanets must be less than twice the size of the Earth and orbit their own sun within the habitable zone. This "Goldilocks zone" is a belt in solar systems where it's neithe...
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