Astronomers Find Evidence for a Moon Outside Our Solar System

Credits: NASA/ESA/L. Hustak

(From Science Daily)

A pair of Columbia University astronomers using NASA’s Hubble Space Telescope and Kepler Space Telescope have assembled compelling evidence for the existence of a moon orbiting a gas-giant planet 8,000 light-years away.

In a paper published Oct. 3 in the journal Science Advances, Alex Teachey and David Kipping report that the detection of a candidate exomoon — that is, moons orbiting planets in other star systems — is unusual because of its large size, comparable to the diameter of Neptune.

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