Astronomers have discovered more than 800 exoplanets, with many more candidate worlds awaiting confirmation by follow-up observations. Most of them, however, are gas giants, similar to Jupiter, and only a handful have a solid surface and orbit their host stars in the habitable zone, the range where liquid water, and perhaps life as we know it, can exist.
But a team of astronomers says these uninhabitable exoplanets could host habitable exomoons.
"There is a habitable zone for exomoons, it's just a little different than the habitable zone for exoplanets," Rory Barnes of the University of Washington and the NASA Astrobiology Institute said in a statement.
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