The tantalizing Enceladus images were snapped by the Cassini spacecraft, an international project managed by NASA's Jet Propulsion Laboratory in Pasadena. Cassini plans at least one more pass by Enceladus, in 2008, which could reveal further details of the moon's potential to harbor life - though not the presence of life itself.
The space agency hasn't ruled out extending that mission, said Andrew Dantzler, director of NASA's solar system division. But any future mission to Enceladus would come after a Europa trip, he said.
``I believe all these great missions that we want to do, we will do,'' he said. ``We just have to space them out.''