It’s hard not to love Europa. It is far and away the most promising of Jupiter’s 79 moons, covered in a rind of water ice perhaps 30 km (18 mi.) thick. Beneath the ice lies a salty, globe-girdling ocean that astronomers estimate could be up to 150 km (93 mi.) deep. As its larger sister…

The Hunt for Life On Jupiter’s Moon Europa Just Got a Little Easier