Saturn: November 2017

Daphnis, one of Saturn's small ring-embedded moons, is seen here kicking up waves as it orbits within a gap between rows of icy ring particles.

Heat from friction could power hydrothermal activity on Saturn's moon Enceladus for billions of years if the moon has a highly porous core, according to a new modeling study by European and U.S. researchers working on NASA's Cassini mission.