Astronomers have discovered the first confirmed atmosphere on a rocky, Earth-like exoplanet located within its star’s habitable zone [1, 2, 3].
The finding provides critical evidence that rocky worlds orbiting distant stars can retain atmospheres. This discovery increases the probability that scientists will find life beyond the Solar System by proving these environments can support the gaseous envelopes necessary for liquid water and biological stability [1, 3, 6].
The planet, known as LHS 1140 b, is located approximately 48 light-years from Earth [1, 3]. It orbits a red dwarf star called LHS 1140 [3, 5]. Researchers said they discovered the planet on July 16, 2026 [4, 6].
Data indicates that LHS 1140 b possesses a helium-rich atmosphere [3]. While many rocky planets in habitable zones are stripped of their air by stellar radiation, this planet has managed to hold onto its atmospheric layer, a rare find for a world of this type [3, 4].
The research team used advanced observational techniques to detect the presence of the gas. By analyzing the light passing through the planet's periphery, the team confirmed the atmosphere's composition [1, 2].
This detection marks a shift in exoplanetary science. Previously, confirmed atmospheres were primarily found on gas giants or planets outside the habitable zone. The confirmation of a gaseous layer on a rocky world in the "Goldilocks zone" suggests that the conditions for life may be more common than previously estimated [3, 6].
“The discovery provides strong evidence that rocky worlds in habitable zones can retain atmospheres.”
The detection of an atmosphere on LHS 1140 b resolves a major uncertainty in astrophysics regarding whether rocky planets orbiting red dwarfs can survive the intense radiation of their host stars. Because a helium-rich atmosphere was confirmed, researchers now have a concrete target for future missions to search for biosignatures, such as oxygen or methane, which would indicate the presence of biological activity.
