WASP-193
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WASP-193 is a binary star system located about 1,232 light-years away from Earth, in which the more massive star is orbited by a planet, which orbits the host star with an orbital period of 6.25 days, and its anomalously expanding hydrogen helium atmosphere and evolutionary mechanism pose a major challenge to existing theories of planet formation, and at the same time, the planet also has extremely low density, with an average density of only 0.059 g/cm3, which is close to the density level of marshmallows, making it the second lowest density exoplanet ever discovered
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