A new study reports the strongest evidence yet that LHS 1140 b — a rocky planet sitting in the habitable zone of a nearby star — really does hold an atmosphere, making it the first Earth-like world we know of with one.
For years, astronomers have catalogued thousands of planets beyond our Solar System, yet almost none look like a place where life as we know it could survive. Gas giants dominate the lists, and most rocky worlds orbit too close to their stars. That picture just shifted: a team publishing in Science on July 16, 2026, now reports the most convincing case to date that LHS 1140 b, a rocky super-Earth in the habitable zone, keeps a genuine atmosphere of its own.
LHS 1140 b circles a cool red dwarf star about 48 to 50 light-years away — a near neighbour by galactic standards. It is roughly 1.7 times Earth's radius and about five to six times Earth's mass, which makes it a dense, silicate-and-iron "super-Earth" rather than a fluffy gas ball. Its star is small and dim, so the habitable zone — the orbital band where temperatures could permit liquid water — sits close in, and the planet orbits right inside it. That combination had already made it one of the most scrutinized targets in the search for life.
Rather than imaging the atmosphere directly, the team detected helium escaping from the planet and being continuously refilled from below. A steady leak that is balanced by an internal source is strong evidence of a substantial, long-lived native atmosphere — not a transient wisp stripped away long ago. The planet is also "tidally locked," keeping one face turned permanently toward its star, which shapes how any air would circulate.
Until now, habitability arguments about rocky planets rested on theory: we had never actually confirmed one in the habitable zone kept an atmosphere. LHS 1140 b turns that hypothesis into an observed case. If one nearby rocky world in the right orbit has air, others very likely do too — and the hunt for biosignatures can move from pure modelling toward real, targetable objects. The next decade of telescope time will almost certainly keep this small, distant world in its crosshairs.
The deeper lesson is methodological: we find what our instruments are built to see. By watching not the planet's size but the chemistry of what escapes it, astronomers opened a door that raw size surveys had kept shut.