A Nuclear-Powered Tunneling Robot that Could Search for Life on Europa

The search for life has led astronomers to the icy moons in our Solar System. Among those moons, Europa has attracted a lot of attention. Europa is Jupiter’s fourth-largest moon--and the sixth-largest in the Solar System--at 3,100 kilometres (1,900 mi) in diameter. Scientists think that its oceans could contain two or three times as much …