Exoplanets come in all shapes and sizes, and if recent discoveries have taught us anything, they also serve their own kind of extreme conditions. Some are so hot that it quite literally rains molten rocks, while others are dense enough to be regarded as a planet-sized chunk of diamond. The latest addition to the series is WASP-193b, a huge planet with such low density that scientists have likened it to cotton candy. The planet, roughly 1,200 light-years away from
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