There are planets built like fortresses, dense, compact, and dominated by gravity. And then there is WASP-107b, a world so light for its size that astronomers often compare it to a marshmallow floating in space. Located about 200 light-years away in the constellation Virgo, WASP-107b is nearly the same radius as Jupiter, yet contains only about one-tenth of Jupiter’s mass. The result is one of the lowest densities ever measured for a planet so diffuse that its outer atmosphere fades gradually in
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There are planets built like fortresses, dense, compact, and dominated by gravity. And then there is WASP-107b, a world so light for its size that astronomers often compare it to a marshmallow floating in space. Located about 200 light-years away in the constellation Virgo, WASP-107b is nearly the same radius as Jupiter, yet contains only about one-tenth of Jupiter’s mass. The result is one of the lowest densities ever measured for a planet so diffuse that its outer atmosphere fades gradually in
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