It's got a fancy, scientific name, but you can just call it the Puffy Planet. Scientists say they've discovered the largest planet ever seen orbiting another star. And it's so puffy, it would float on water.
It moves fast. While Earth takes a year to orbit the sun, this new planet orbits its parent star once every 4½ days.
Astronomers used a network of telescopes in Arizona and Hawaii to discover the planet, which they think may be part of an entirely new class of planets.
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