This image provided by NASA shows an artist rendering of the newfound planet known as Kepler-37b. The planet is about the size of Earth's moon and is the smallest known exoplanet, according to a study published in the Thursday Feb. 21, 2013, issue of the journal Nature. (NASA, Ames, JPL-Caltech / Associated Press)
Read the article: Smallest planet on record found outside Earth's solar system
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