Astronomers are puzzled by Kepler-51’s ultra-light “super-puff” planets. Even NASA’s James Webb Space Telescope failed to detect their atmospheres, hinting at thick hydrocarbon haze and challenging planet formation theories. Some planets defy everything we know about how worlds are built. The Kepler-51 system, located 2,615 light-years away, contains three so-called "super-puff" exoplanets — worlds roughly the size of Saturn but so astonishingly lightweight that their de... [883 chars]
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