Enceladus—a tiny, icy moon of Saturn—is one of the most intriguing objects in the search for signs of life beyond our own planet.

Under a crust of ice lies a global ocean of salty water. Jets, supplied by that ocean, gush from the surface of the moon and feed into the entire system of Saturn. NASA’s James Webb Space Telescope’s long-awaited first look at this ocean world is already revealing staggering new details about the moon — including a plume of water vapor that spouts out more than 20 times the size of the moon itself.