Planetary-mass exosatellite detected around the substellar companion of a star - Nature

1. Planetary-mass exosatellite detected around the substellar companion of a star  Nature
2. Astronomers Discover the First Known Moon Outside our Solar System—and What a Moon it Is  Time Magazine
3. Strange Milky Way planetary system leaves scientists puzzled  Reuters
4. A newly found world blurs the boundary between planet and moon  Science News
5. A huge cosmic object could force astronomers to rethink what a moon is  Scientific American

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