Detected by NASA's Tess satellite over the past decade, these two especially puffy-puffs orbit a star in the southern constellation Volans, known as the flying fish. The researchers studied the planets' orbits using telescopes on Earth to determine their density, from 1,110 light-years away. A light-year is nearly 6 trillion miles (9.7 trillion kilometers). Jupiter, by comparison, is as much as 35 times denser than these two lightweights.
Considered rare in the cosmos, super-puffs are thought to form around the disk of gas and dust around a newborn star where there is more gas than dust. They shed much of the material over time, stripping down even more. NASA's tally of worlds outside our solar system currently stands at nearly 6,300 confirmed. Fewer than 40 are super-puffs, according to Dransfield. The findings have been published in the journal Monthly Notices of the Royal Astronomical Society.
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