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The first atmosphere is detected around a rocky habitable-zone exoplanet
Claim
Astronomers detected an atmosphere containing helium around LHS 1140 b, a rocky, Earth-like world in the habitable zone of a red dwarf 48 light-years away, the first direct atmosphere detection for any rocky exoplanet.
Reported metric: 48 light-years
Reporting date: (not necessarily the event date)
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