NASA discovers two Earth-sized planets

NASA's Kepler mission discovered the first Earth-sized planets orbiting a sun-like star outside our solar system. Called Kepler-20e and Kepler-20f, the planets are not in the habitable zone. NBC’s Brian Williams reports.

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>>> a lot of discovering of new planets going on lately. they just discovered one a few days back, and now they found two more. the new ones are kepler 20-e and 20-f. both planets are close to earth's size. the bummer is the temperature. daytime highs averaging 800 and 1,400 degrees. it's a dry 800 and 1,400 degrees. while it would take any known spacecraft millions of years to get there, it's nice to know they're out there.

NASA discovers two Earth-sized planets

NASA's Kepler mission discovered the first Earth-sized planets orbiting a sun-like star outside our solar system. Called Kepler-20e and Kepler-20f, the planets are not in the habitable zone. NBC’s Brian Williams reports.

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