NASA's Kepler mission has identified 461 new planet candidates, the space agency announced today.
Four of the planet candidates orbit in their sun's "habitable zone," meaning liquid water might exist on their surfaces, NASA said. The new findings are based on an analysis of data collected from May 2009 to March 2011.
Kepler has now identified a total of 2,740 potential planets orbiting 2,036 stars. NASA estimates there are billions of Earth-size alien planets in the Milky Way galaxy alone -- perhaps 100 billion or more.
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