Europa
Galileo images of Europa indicated that "warm ice" or even liquid water may have existed, and perhaps still exists today beneath Europa's cracked icy crust. Impact craters on Europa show that Europa's ice crust may be more than 3 to 4 kilometers thick. Potentially, life may exist in these deep oceans. There are plans for a melting probe which can melt through the ice and carry out investigation in the liquid ocean expected underneath.

'Astronomy Now' Magazine front cover