Kepler-37b
Sub-Earth orbiting Kepler-37, currently the smallest known exoplanet
Kepler-37b
Kepler-37b is an exoplanet orbiting the star Kepler-37 in the constellation Lyra. As of February 2013, it is the smallest planet discovered around a main-sequence star, with a radius slightly greater than that of the Moon and slightly smaller than that of Mercury. The measurements do not constrain its mass, but masses above a few times that of the Moon give unphysically high densities.
Read on Wikipedia · Image NASA/Ames/JPL-Caltech, Public domain
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