A newly discovered planet could host liquid water and thus be friendly to life, astronomers say.
, lies about 31 light-years away in the constellation Hydra. It’s only 22% larger than Earth and circles its star every 3.9 days — tracing an orbit that’s 11 times closer to its star than Mercury’s is to our sun.
That uninhabitable world was the only one around this star spotted by TESS, which scans the skies looking for dips in a star’s light that might indicate that a planet is passing, or transiting, in front of it.Astronomers used information from the ground-based telescopes to confirm GJ 357 b’s existence. In the process, they noticed clues that an additional pair of planets was also circling the same star.
GJ 357 c weighs in at about 3.4 times Earth’s mass, if not more, and orbits the star every 9.1 days at a distance more than double that of GJ 357 b. This proximity keeps the temperature at around 260 degrees Fahrenheit — not quite as singed as planet b, but still pretty toasty.Advertisement However, if GJ 357 d does turn out to have an atmosphere, this could be a game changer, according to aA dense atmosphere with the right composition could trap some warmth and allow water to remain liquid on the planet’s surface. That’s similar to what, which today is frigid and dry but may once have had a thick atmosphere that allowed liquid water to leave marks all over its ruddy face.
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