NASA's Voyager spacecraft analysis reveals evidence of ocean in Uranus' four largest moons.

The ocean layer is believed to exist between the icy crust and core of the moons and could be miles deep.

The four largest moons - Ariel, Umbriel, Titania, and Oberon - have the ability to retain enough heat caused by radioactive decay to prevent the ocean from freezing over.

Data gathered from the survey helped prioritize further exploration of Uranus to better understand the system surrounding the planet and its moons.

This discovery could pave the way for future exploration beyond Uranus' moons.

Dwarf planets and moons in the solar system have previously shown evidence of oceans in unlikely places, indicating the presence of mechanisms that are not fully understood.

The study used data from multiple flybys of Uranus dating back to the 1980s to uncover new insights into the chemistry and geology of Uranus' moons and other icy moons in the solar system.

The moons of Uranus are insulated enough for heat retention, making them potentially habitable environments.

The moons contain chlorides, ammonia, and enough salt to maintain internal oceans, in addition to the heat source caused by radioactive decay 

Future exploration and observation are needed to develop new models for the origin of the moons and to gain further understanding of these ocean worlds.

The Mystery of Ocean Hole at bottom