Astronomers studying three exoplanets now believe they have identified an extremely rare, extremely puffy type of planet affectionately dubbed “cotton-candy worlds.”

The three young planets orbit the star Kepler 51 roughly 2,600 light-years away and are roughly the size of Jupiter but are so incredibly low-density that they boast less than one percent of its mass. To put things in perspective, they have a density of less than 0.1 grams per cubic centimeter, so we’re talking extremely fluffy here.



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