NASA's planet-hunting telescope, Kepler, rocketed into space March 6 on a historic voyage to track down other Earths in a faraway patch of the Milky Way galaxy, reports the Associated Press. It's the first mission capable of answering the age-old question: Are other worlds like ours out there? Kepler's mission will last at least three-and-a-half years and cost $600 million. The goal is to find, if they exist, Earth-like planets circling stars in the so-called habitable zone--orbits where liquid water could be present on the surface of the planets. That would mean there are other places out there for life...

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