An unsuspecting moon lurking in our solar system has a secret ocean of water that might even harbor extraterrestrial life, scientists have suggested.

The tiny world Miranda, one of the moons of the ice giant Uranus, may have a liquid water ocean underneath its surface, according to a paper in The Planetary Science Journal.

This places Miranda among the few bodies in our solar system that could have a form of life thriving in its water depths.

"To find evidence of an ocean inside a small object like Miranda is incredibly surprising," study co-author Tom Nordheim, a planetary scientist at Johns Hopkins University's Applied Physics Laboratory, said in a statement.

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