Columbia University astronomers find evidence of the first-ever “exomoon” orbiting an exoplanet. Kepler-1625b, which is 4,000 light years away, may have a Neptune-sized moon.

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Columbia University astronomers find evidence of the first-ever “exomoon” orbiting an exoplanet. Kepler-1625b, which is 4,000 light years away, may have a Neptune-sized moon.