Enceladus, the sixth-biggest moon of Saturn, is a top candidate in the search for extraterrestrial life in the Solar System. An artist’s impression of NASA’s Cassini spacecraft flying through plumes erupting from the south pole of Enceladus; these plumes are much like geysers and expel a combination of water vapor, ice grains, salts, methane and other organic molecules. Image credit: NASA / JPL-Caltech. In 2014, NASA’s Cassini spacecraft discovered...