A rocky super-Earth 48 light-years away, approximately 1.7 times the diameter and 5.6 times the mass of our planet, may be capable of sustaining life. The exoplanet, LHS 1140 b, was leaking helium, which could indicate the presence of an atmosphere, a necessary factor for life to flourish, according to a study in the journal Science.
LHS 1140 b shares many qualities with Earth. Though its temperatures are colder than our planet’s, it “orbits a red dwarf star within the star’s habitable zone,” which is the sweet spot in which “temperatures and environmental conditions are within the range that could support liquid water on the planet’s surface,” said a news release about the study. This is the “first time anyone has found an atmosphere on a rocky planet in the habitable zone of another star,” said lead study author Collin Cherubim in the release.
While the findings are promising, “at this point, we have absolutely no evidence for life on the planet,” Cherubim said to The New York Times. “But we think all of the really important, essential ingredients are there.”
The question remains whether LHS 1140 b is “bare rock with no atmosphere that sometimes burps up some gas that then immediately escapes” or if there’s a “steady-state atmosphere there that will leak out stuff like the Earth does from time to time,” said University of Florida assistant professor of astronomy Jason Dittmann, who discovered the planet, to The Independent.
Even if this exoplanet is not the next Earth, “if one potentially organic world is out there, countless others could be too,” said Time. The existence of potentially viable planets “dramatically” boosts the odds of alien life.
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