Enceladus, a tiny Saturnian moon only about 500 kilometres wide, is actively venting water vapour and ice grains into space from a salty ocean hidden beneath its crust — and modelling suggests that ocean may have remained warm and chemically active for geological timescales, perhaps long enough for life to have had a chance to emerge.

Enceladus, a tiny Saturnian moon only about 500 kilometres wide, is actively venting water vapour and ice grains into space from a salty ocean hidden beneath its crust — and modelling suggests that ocean may have remained warm and chemically active for geological timescales, perhaps long enough for life to have had a chance to emerge. – Space