NASA's planet-hunting space telescope Kepler is slated to launch the night of March 6 from Kennedy Space Center in Cape Canaveral, Florida, on a mission to find Earth-sized planets that could have liquid water at the surface and potentially harbor life."It's not just another science mission. This one has historical significance built into it," said Ed Weiler of the Science Mission Directorate at NASA headquarters. "It very possibly could tell us that earths are very, very common, that we've got lots of neighbors out there. Or it could tell us that Earths are really, really, really rare."
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