<P> Enceladus was discovered on August 28 , 1789 , by William Herschel , but little was known about it until the two Voyager spacecraft , Voyager 1 and Voyager 2 , passed nearby in the early 1980s . In 2005 , the Cassini spacecraft started multiple close flybys of Enceladus , revealing its surface and environment in greater detail . In particular , Cassini discovered water - rich plumes venting from the south polar region . Cryovolcanoes near the south pole shoot geyser - like jets of water vapor , molecular hydrogen , other volatiles , and solid material , including sodium chloride crystals and ice particles , into space , totaling about 200 kg ( 440 lb ) per second . Over 100 geysers have been identified . Some of the water vapor falls back as `` snow '' ; the rest escapes , and supplies most of the material making up Saturn 's E ring . According to NASA scientists , the plumes are similar in composition to comets . In 2014 , NASA reported that Cassini found evidence for a large south polar subsurface ocean of liquid water with a thickness of around 10 km ( 6 mi ) . </P>
<P> Enceladus was discovered on August 28 , 1789 , by William Herschel , but little was known about it until the two Voyager spacecraft , Voyager 1 and Voyager 2 , passed nearby in the early 1980s . In 2005 , the Cassini spacecraft started multiple close flybys of Enceladus , revealing its surface and environment in greater detail . In particular , Cassini discovered water - rich plumes venting from the south polar region . Cryovolcanoes near the south pole shoot geyser - like jets of water vapor , molecular hydrogen , other volatiles , and solid material , including sodium chloride crystals and ice particles , into space , totaling about 200 kg ( 440 lb ) per second . Over 100 geysers have been identified . Some of the water vapor falls back as `` snow '' ; the rest escapes , and supplies most of the material making up Saturn 's E ring . According to NASA scientists , the plumes are similar in composition to comets . In 2014 , NASA reported that Cassini found evidence for a large south polar subsurface ocean of liquid water with a thickness of around 10 km ( 6 mi ) . </P>
which one of saturn 's moons has water
which one of saturn 's moons has water
Enceladus
Enceladus