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“Astronomers have discovered a planetary-mass exosatellite around a substellar companion of a star, a first-of-its-kind finding that challenges our understanding of what a moon is.”
Planetary-mass exosatellite detected around the substellar companion of a star Nature Astronomers Discover the First Known Moon Outside our Solar System—and What a Moon it Is Time Magazine Exoplanet or Exomoon?
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Originally reported by Google News - Science
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Astronomers have detected a planetary-mass exosatellite around a substellar companion of a star.
This is the first known moon outside our solar system.
The discovery challenges our understanding of what a moon is and may force astronomers to rethink their definition.
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