LHS 1140 b
First confirmed atmosphere on a rocky planet in a habitable zone — Harvard, July 17, 2026
speed
transmission spectroscopy · 900–1200 nm
No transit — baseline stellar flux. Watch for the planet to cross the stellar disk to reveal the helium absorption signature.
48light-years
in the constellation Cetus
5.6×Earth mass
dense enough to be definitively rocky
1.73×Earth radius
super-Earth classification
24.7-dayorbit
inside the habitable zone
3+ billionyears old
atmosphere survived stellar wind stripping
detection pipeline
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