Four out of five Uranus moons likely to have ocean under crust
on the Voyager data investigated what those mechanisms could be and how they play out in celestial bodies rich in water with limited internal heat.
Absent the right amount of heat, the study suggested that chlorides like ammonia or salt are likely abundant in the moons and could act as an antifreeze, able to maintain the ocean layer. Currently Voyager 2 is the only spacecraft to have visited Uranus. A proposed Uranus Orbiter and Probe mission is now considered a top priority by NASA and would further test the moons for oceans, as well as the planet's own atmosphere and other characteristics.
The hunt for oceans on the moons could be conducted by measuring their magnetic fields – as long as they are hypersaline. However, if the ocean is primarily ammonia, low temperatures could make electrical conductivity too small to detect water. UOP was originally slated to launch in 2031 but a shortage of plutonium has pushed that date back to the mid to late 2030s. The spacecraft will not arrive near Uranus until over a decade after launch. ®
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