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FILE - This 1986 file picture shows part of the Milky Way galaxy as seen from Australia. Scientists have estimated the first cosmic census of planets in our galaxy and the numbers are astronomical: at least 50 billion planets in the Milky Way. At least 500 million of those planets are in the not-too-hot, not-too-cold zone where life could exist, scientists announced Saturday, Feb. 19, 2011. The numbers were extrapolated from the early results of NASA's planet-hunting Kepler telescope. (AP Photo)

FILE - This 1986 file picture shows part of the Milky Way galaxy as seen from Australia. Scientists have estimated the first cosmic census of planets in our galaxy and the numbers are astronomical: at least 50 billion planets in the Milky Way. At least 500 million of those planets are in the not-too-hot, not-too-cold zone where life could exist, scientists announced Saturday, Feb. 19, 2011. The numbers were extrapolated from the early results of NASA's planet-hunting Kepler telescope. (AP Photo)

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