Some planets defy every part we learn about how worlds are constructed. The Kepler-51 system, positioned 2,615 light-years away, comprises three so-called “super-puff” exoplanets — worlds roughly the dimensions of Saturn however so astonishingly light-weight that their density is corresponding to cotton sweet. Found by NASA’s Kepler House Telescope, these weird worlds have now stumped even probably the most highly effective observatory ever launched.
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