Helium Escaping LHS 1140 b Confirms First Habitable - Zone Rocky Atmosphere

For decades, astronomers hunting for life on other worlds faced a maddening gap in the evidence: they could find rocky planets positioned at the right distance from their stars, but they could not confirm whether any of those planets had managed to hold onto an atmosphere. Without one, even a perfectly placed world is an airless rock. On July 17, 2026, that gap closed for the first time. A Harvard-led team reported in Science that LHS 1140 b — a super-Earth orbiting a red dwarf 48 light-years away in the constellation Cetus — shows helium escaping from its upper atmosphere, confirming the planet retains a real, persistent atmosphere that has survived for more than three billion years. The finding is the first confirmed atmosphere on any rocky planet in a stellar habitable zone — the band of orbital distances where liquid water could exist on a surface. "An atmosphere is essential for a planet to support life as we know it," said lead author Collin Cherubim, who recently completed his doctorate in Earth and Planetary Sciences at Harvard University. "This is the first time anyone has found an atmosphere on a rocky planet in the habitable zone of another star."…