Billions of Earth-Like Planets in the Galaxy

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This artist's conception shows the inner four planets of the Gliese 581 system and their host star, a red dwarf star only 20 light years away from Earth.
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A new analysis of data collected by NASA'S Kepler spacecraft shows that there could be as many as 40 billion habitable planets similar to the size of Earth in the galaxy. Like Earth, the planets should have just the right temperatures to support liquid water.

These findings come from new analysis of data collected by NASA's Kepler spacecraft.

Sara Seager, Professor of Planetary Science and Physics at the Massachusetts Institute of Technology, discusses the possibility of life outside of Earth, and why it might not be such a far-flung sci-fi fantasy.