# Cassini spacecraft
NASA Scientists' Astonishment at Enceladus
Enceladus is perhaps one of the most intriguing objects in the entire Solar System. And yet, it is only the sixth-largest moon of Saturn, and in natural light, it looks very unassuming. However, there’s a lot more to Enceladus than meets the eye. It’s an active, icy world, with jets of water vapor pouring out from its southern hemisphere.