Nearly 50 light-years from Earth, a rocky planet is quietly rewriting what astronomers thought was possible.
For the first time, scientists have directly detected an atmosphere around a rocky exoplanet, and remarkably, that same planet sits squarely within its star’s habitable zone, the narrow band of orbital distance where liquid water could exist on a planet’s surface. The discovery marks a genuine milestone in the decades-long search for worlds beyond our solar system that might actually be capable of supporting life.
Meet LHS 1140 b
The planet, named LHS 1140 b, orbits a star roughly 48 light-years from Earth. According to the new research, it possesses an atmosphere containing helium, making it the first rocky exoplanet ever confirmed to have a directly detected atmosphere.
“We really directly detected helium in that atmosphere, and this is the first direct detection for any rocky exoplanet,” said Collin Cherubim, the study’s lead author, who recently earned his Ph.D. from Harvard University. “Then there’s the added bonus that it’s in the habitable zone, which is really exciting for astrobiology, for habitability studies, and for the search for life.”
The planet was first discovered back in 2017 by a team led by astronomer Jason Dittmann, who now co-authors this latest breakthrough. “This planet was discovered about 10 years ago, and only now can we say, ‘okay, that’s an atmosphere,'” Dittmann said, underscoring just how long this confirmation took to arrive.
Why Scientists Call It “Earth-Like”
LHS 1140 b isn’t a carbon copy of Earth, but it shares two defining characteristics that make the comparison meaningful. First, its overall composition: rocky, likely possessing an iron core, and now confirmed to have an atmosphere. Second, and perhaps more importantly, its temperature sits squarely within what scientists call the “Goldilocks zone,” the precise orbital sweet spot where conditions are neither too hot nor too cold for liquid water, an essential ingredient for life as we understand it, to exist on the surface.
The planet orbits a red dwarf star, smaller and cooler than our Sun, but because LHS 1140 b orbits much closer to its star than Earth does to the Sun, it still receives enough warmth to sit within that critical habitable range.
Why This Discovery Took Nearly a Decade
Confirmed exoplanet discoveries date back more than 30 years, and scientists have since cataloged more than 6,000 of them, with new additions constantly emerging. While several rocky planets have previously been found within habitable zones, none had ever had their atmosphere directly confirmed, until now.
Part of the reason this took so long comes down to the type of star LHS 1140 b orbits. Red dwarf stars are the most common type of star in the universe, roughly a third the size of our Sun, but they’re also notoriously volatile. These stars frequently unleash extreme radiation bursts, including solar flares and coronal mass ejections, powerful enough to strip away a planet’s atmosphere entirely over time.
That’s precisely what makes this discovery so significant. “This discovery is a big deal because it shows that at least this one rocky planet has maintained its atmosphere for billions of years,” Cherubim told Live Science, highlighting that LHS 1140 b appears to have survived billions of years of stellar bombardment with its atmosphere intact, something scientists weren’t certain was even possible for planets orbiting this kind of star.
Does This Mean There’s Life Out There?
It’s the question that inevitably follows any discovery like this: a rocky planet, with a confirmed atmosphere, sitting in its star’s habitable zone. It checks more boxes than nearly any exoplanet discovered to date in the ongoing search for potentially habitable worlds.
But researchers are careful to temper expectations. Despite meeting so many of the criteria scientists look for, there currently isn’t enough data to draw any conclusions about whether LHS 1140 b actually harbors life, or could ever support it. What scientists do know is that this discovery opens the door to a new kind of investigation: for the first time, they have a confirmed atmosphere on a potentially habitable rocky world to actually study in detail, rather than theorize about from a distance.
For now, LHS 1140 b stands as a reminder of how much remains undiscovered in our galactic neighborhood, and how a planet found a decade ago can still surprise scientists with a discovery this significant, once the right tools finally catch up to the question.