Enceladus

Europa and Enceladus are thought to have an ocean of liquid water beneath their surface.

We thought Enceladus was just boring and cold until the Cassini mission discovered a liquid water subsurface ocean.

If you like astrobiology, maybe read the research paper "Habitability of Enceladus: Planetary Conditions for Life."

If you like astronomy, maybe read the paper "Ongoing hydrothermal activities within Enceladus."

This artist rendering shows a cutaway view into the interior of Saturn’s moon Enceladus.

The scientists say the existence of these large complex molecules, along with hydrothermal activity, supports a theory that a massive liquid water ocean, below the icy crust of Enceladus, may provide a habitable environment for life.