New measurements show Jupiter is slightly smaller and flatter, improving models of its interior and atmosphere.

Since the 1990s, astronomers have found a handful of other dwarf planets in the belt, such as Eris and Sedna, along with ...

A planetary system 116 light-years from Earth has a peculiar pattern. It could flip the script on how planets form, scientists say.

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When Voyager 2 flew past Neptune, it revealed a planet far more extreme than anyone expected. Beneath the calm blue appearance were supersonic winds, massive storms, and an interior unlike any other ...