Universe & space

Discovery of Kepler-37 b

20 February 2013

Kepler-37 b was announced in 2013 as the smallest exoplanet known at the time, about the size of the Moon. It was found by NASA's Kepler space telescope, which detected the slight dimming of the star Kepler-37 as the planet passed in front of it. The star is a little smaller than the Sun and lies in the constellation Lyra, a couple of hundred light-years away. Kepler-37 b orbits very close to its star in about thirteen days, so it is far too hot for life, and it is probably rocky with no real atmosphere. Two other planets, Kepler-37 c and d, were found in the same system.

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