Found! Tiny Moon-Size Alien World Is the Smallest Exoplanet

SPACE.com
Found! Tiny Moon-Size Alien World Is the Smallest Exoplanet
Two of the three planets orbiting the star Kepler-37 are smaller than the Earth while the third is twice Earth's size. Kepler-37b is about 80 percent the size of Mercury and is the first exoplanet to be found that is smaller than any planet in
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