Moons Europa , Enceladus , and Titan are covered with solid water ice . Scientist Kevin Peter Hand says there could be vast liquid water oceans underneath the ice . Comment: But some may ask : Exploring Earth 's oceans might help us understand fundamental geological and biological cycles .
Moons Europa , Enceladus , and Titan are covered with solid water ice . Scientist Kevin Peter Hand says there could be vast liquid water oceans underneath the ice . Comment: Exploring Earth 's oceans might help us understand fundamental geological and biological cycles .