One of the fluffiest exoplanets we've ever found in the Milky Way galaxy is challenging our understanding of how giant planets form. It's called WASP-107b, orbiting an orange dwarf star 211 light-years away, and it was already known as one of the lowest density exoplanets when its discovery was announced in 2017. A new analysis shows the puffy planet is even puffier than astronomers thought.