Found Tiny Moon Size Alien World Is The Smallest Exoplanet

An artist's conception of the tiny alien planet Kepler-37b, which is slightly larger than Earth's moon and orbits its host star every 13 days. It likely has a surface temperature of in excess of 400 deg C (700 deg F). Image released Feb. 20, 2013.

The discovery of a strange new world about the size of Earth's moon has shattered the record for the smallest known alien planet, scientists say.

The newfound alien planet Kepler-37b is the first exoplanet discovered to be smaller than Mercury. It whips around its parent star every 13 days and has a roasting surface temperature of about 800 degrees Fahrenheit (427 Celsius), researchers said. It not a promising contender for life, they added.

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