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Our Solar System, like a sneaky little hobbit, seems to have stuffed its pockets full of hidden oceans. Jupiter, Saturn, Uranus, and Neptune all have moons astronomers think might be harboring liquid ...

New research on the Uranian moon Ariel suggests the icy world may be hiding a deep secret. Credit: NASA / JPL Scientists think one of Uranus' moons may once have had an ocean roughly 100 miles deep — ...

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Could Uranus’s moon Ariel have once harbored a vast, deep ocean beneath its icy crust—perhaps even one that still lingers today? This discovery expands the growing family of “ocean worlds”—planets and ...