First Atmosphere Confirmed on Habitable-Zone Rocky Exoplanet LHS 1140 b

Exoplanet science has advanced from the 1995 discovery of gas-giant 51 Peg b to Kepler’s 2009 census of small worlds, but characterization stalled—much like 19th-century astronomers mistaking Martian “canals” for proof of civilization—until today’s helium detection broke the impasse. The result vindicates models suggesting some M-dwarf planets can resist atmospheric erosion despite intense stellar activity, hinting at a broader class of long-lived, potentially habitable super-Earths. Over a 100-year horizon, the shift from counting planets to probing their climates may parallel the leap from early spectroscopic stellar surveys to modern stellar astrophysics, laying empirical groundwork for biosignature searches and guiding telescope design far into the 22nd century.