The Most Amazing Alien Planet Discoveries of 2013
By: Mike Wall - published: December 29, 2013
Data from NASA's Kepler mission finds evidence for at least 100 billion planets in our galaxy. Image released January 3, 2013.
While astronomers didn't bag that elusive first "alien Earth" in 2013, they made plenty of exciting exoplanet discoveries during the past year.
This artist's illustration represents the variety of planets being detected by NASA's Kepler spacecraft. Scientists now say that one in six stars hosts an Earth-size planet.
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