A Guide to the Unearthly Oceans in Our Solar System

The ‘Ice Giants,’ Uranus and Neptune

Uranus (left) and Neptune. Image: NASA/JPL-Caltech

Hard to believe, but liquid oceans could also exist in the atmospheres of our two ice giants, Neptune and Uranus. This hasn’t been proven, but research from 2007 suggests it’s possible. Liquid water could exist deep inside these planets where the temperature and atmospheric pressure is just right. If oceans are real on Neptune and Uranus, they could account for as much as two-thirds of their total mass, according to NASA.

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