BOSTON, October 12 — Scientists have detected signs of an atmosphere around the rocky exoplanet LHS 1140 b for the first time, using the Hubble Space Telescope. The discovery marks a significant step in the search for potentially habitable worlds beyond our solar system. The planet lies about 49 light-years from Earth and orbits within the habitable zone of its star, where temperatures could allow liquid water to exist on its surface.
Researchers say the presence of an atmosphere raises the possibility that conditions suitable for life might exist there. The research team, led by astronomers studying exoplanet atmospheres, analyzed light from the star as it passed through the planet’s outer layers during transit.
By measuring how different wavelengths were absorbed, they identified patterns consistent with an atmospheric envelope. While the exact composition remains unknown, the detection itself is a milestone. Earlier observations had only been able to estimate the planet’s size and mass, suggesting it is a super-Earth with a rocky composition.
Now, for the first time, scientists have direct evidence that it holds onto a gaseous shroud. “This is the first hint we’ve seen of an atmosphere on LHS 1140 b,” said one of the researchers involved in the study.
“It opens the door to understanding what the planet is really like — not just its size and orbit, but what its surface might be experiencing.” The team emphasized that while the atmosphere’s presence is promising, it does not confirm habitability. They caution that the atmosphere could be thin, dominated by gases like hydrogen or helium, or even stripped away by stellar radiation over time. The practical upshot is that scientists now have a target for deeper investigation.
Think of it like finding the first smoke signal on a distant island — it doesn’t tell you who lit the fire or whether anyone’s still there, but it means something worth looking at is happening. The researchers plan to use next-generation telescopes, including the James Webb Space Telescope, to study the planet’s atmosphere in greater detail. Those observations could reveal whether it contains water vapor, methane, or other molecules that might hint at biological or geological processes.
What follows will be a careful campaign to decode the atmosphere’s makeup and stability. If future observations show signs of gases in disequilibrium — such as oxygen alongside methane — it could strengthen the case for ongoing biological activity.
But even without life, understanding LHS 1140 b’s atmosphere will teach us how rocky planets retain or lose their envelopes in the harsh environments around red dwarf stars. That knowledge will help refine the criteria for habitability across the galaxy. For now, the detection stands as a proof of concept: we can probe the atmospheres of small, temperate worlds many light-years away.
As technology improves, more such planets will come into view. The team hopes their work encourages broader surveys of similar targets, building a statistical picture of how common atmospheres are among rocky planets in habitable zones.
Each new measurement brings us closer to answering whether we are alone — not with certainty, but with growing clarity.
