The four biggest moons of Uranus may harbour salty oceans below their frozen surfaces. Scientists taking a fresh look at T 40-year-old data sent home by NASA’s Voyager 2 spacecraft say that the satellites Titania and Oberon, which orbit the furthest from Uranus among the group, may be home to buried oceans 30 miles (50 kilometres) deep, while those of Ariel and Umbriel may be 19 miles (30 kilometres) deep. The new research explains how the persistent internal heat of the Uranian moons and a few
