Atmospheres have previously been found around gas giant exoplanets as well as “sub-Neptunes”. There have also been signs of such envelopes around rocky exoplanets that sit outside their star’s habitable zone – a region in which liquid water could exist on the planet’s surface, and hence potentially support life.
But the new discovery is different.
“This is the first actually observationally confirmed atmosphere on a rocky planet in the habitable zone outside of our solar system,” said Dr Collin Cherubim, the first author of the study, who until recently was based at Harvard University.
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