Discovered: The first habitable 'Earth-like' planet

NASA's Kepler telescope makes a startling, exciting find: An alien world eerily similar to our own, right down to the pleasant summer temperature

An artist's conception of Kepler-22b, a planet 600 light years away from Earth, and the first confirmed planet outside our solar system that could conceivably harbor life as we know it.
(Image credit: NASA/Ames/JPL-Caltech)

Say hello to "Earth 2.0." NASA's planet-hunting Kepler spacecraft has discovered an alien world that might just support life as we know it. Here's what you need to know about Earth's new celestial cousin, Kepler-22b:

What exactly is the Kepler mission?

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