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Vote Now! Most Intriguing Alien Planets of 2011

Kepler-20e: Alien Planet Smaller Than Earth

NASA/JPL-Caltech/T. Pyle

NASA capped the year 2011 as it began, with the announcement of Kepler-20e, the smallest alien planet yet found, which orbits a star 950 light-years from Earth.

Kepler-20e is only about 87 percent the width of Earth. It is 6,900 miles wide. The Earth is about 7,900 miles wide.

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