NASA discovers moon-sized planet 210 light years away
Kepler-37b
Credit: NASA/Ames/JPL-Caltech
The artist's concept depicts the new planet dubbed Kepler-37b. The planet is slightly larger than our moon, measuring about one-third the size of Earth. Kepler-37b orbits its host star every 13 days at less than one-third the distance Mercury is to the sun.
