After finding tantalizing clues that liquid water once flowed on Mars (and may still exist under the surface), of water ice on the moon and an ocean under thick ice on Jupiter's moon Europa, NASA has confirmed the existence of liquid on yet another moon, Saturn's tiny Enceladus.

And of course, what is most exciting to scientists is that where there's water — particularly liquid water — there just might be life.

As NPR's Nell Greenfieldboyce reports, NASA's Cassini probe has been studying Saturn and its moons for about a decade, and that it transmitted images of Enceladus in 2005 that looked promising: "Water vapor and ice was spewing out of its south polar region, where scientists saw long fractures that they nicknamed tiger stripes," she says.