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[TECHNOLOGY] · United Kingdom, United States, Chile · 53 sources

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Part of situation: Atmosphere confirmed on habitable-zone exoplanet LHS 1140 b (9 clusters)

LHS 1140 b’s Atmosphere Detected, First Around Rocky Habitable‑Zone Exoplanet

LHS 1140 b atmosphere detection helium escape habitable zone Magellan Clay Telescope

Astronomers have confirmed the presence of an atmosphere on the rocky exoplanet LHS 1140 b, located about 48 light‑years from Earth and orbiting a red‑dwarf star within its habitable zone. Using the WINERED spectrograph on the Magellan Clay Telescope in Chile, the team detected escaping helium, a signature that implies a sustained atmospheric layer despite the planet’s billions‑year exposure to stellar radiation. The discovery, published in *Science*, marks the first confirmed atmosphere for a rocky planet in a habitable zone.

The planet has roughly 5.6 times Earth’s mass and a surface gravity about twice that of Earth. Its calm red‑dwarf host likely helped preserve the atmosphere, raising the prospect of liquid water and making LHS 1140 b a key target for future habitability studies. Researchers emphasize that while the detection does not prove life, it provides a crucial benchmark for assessing the habitability of Earth‑like worlds beyond the Solar System.

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