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Smithsonian Magazine ·Behind the news

Could Life Exist on This Nearby World? In a First, Astronomers Find an Atmosphere on an Earth-Like Exoplanet in the Habitable Zone

Published 2026-07-21 16:23:23+00:00

If a rocky world 49 light-years away has air and water, is life the only thing missing?

0:00 / 5:52 · Narrator Rasalgethi

Context

Astronomers pointed the Magellan Clay Telescope at a rocky world 49 light-years away and caught the faint signature of helium escaping into space. In this report from 21 July 2026, finding an atmosphere around exoplanet LHS 1140 b marks a shift from speculating about habitable worlds to actually seeing one. The piece follows researchers as they map the cosmic shoreline, a boundary where some planets hold onto their air while others lose it to the stars. It turns the search for life into a concrete question of chemistry and timing.

Show notes

Astronomers have found an atmosphere on LHS 1140 b, a rocky exoplanet located 49 light-years away. The world orbits in its star's habitable zone, where temperatures may allow for liquid water to exist on the surface. Data from the Magellan Clay Telescope shows escaping helium, suggesting the planet is large enough to retain its gases despite radiation from its host star.

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