Alien Planets Revealed

Season 41 Episode 1 | 53m 7s

It’s a golden age for planet hunters: NASA's Kepler mission has identified more than 3,500 potential planets orbiting stars beyond our Sun. Some of them, like a planet called Kepler-22b, might even be able to harbor life. How did we come upon this distant planet?

Aired: 01/08/14

Expired: 12/29/16

Rating: TV-G

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