Astronomy
Exploring the Possibility of Life in Europa's Subsurface Ocean
Quick fact
Europa's subsurface ocean may contain twice as much liquid water as Earth's entire ocean, and it's estimated to be 60-150 kilometers deep beneath an ice shell several kilometers thick.
Why this is interesting
Beneath the icy crust of Jupiter's moon Europa lies a global ocean with more water than all of Earth's oceans combined. Could alien life be swimming in that dark, hidden sea?