Uranus' 4 biggest moons may have buried oceans of salty water
The four biggest moons of Uranus — Titania, Oberon, Ariel and Umbriel — may harbor salty oceans beneath their frozen surfaces, a new study suggests.
Reference The Lunar Reconnaissance Orbiter (LRO) is an uncrewed spacecraft currently orbiting and studying the moon. We explore the lunar orbiter in more detail here.
Reference Europa is an icy moon of Jupiter and one of the four so-called Galilean moons of Jupiter. See more facts about Europa and its history here.