Curtains of vapor and ice miles high and hundreds of miles long might erupt from rifts on Saturn’s icy, ocean-harboring moon Enceladus, researchers say.
In fact, most of the seemingly discrete geysers seen on Enceladus until now may have just been optical illusions of these much broader “curtain” eruptions, the scientists said in the new study.
Enceladus is Saturn’s sixth-largest moon, a 310-mile-wide (500 kilometers) satellite coated with an icy shell. Years ago, researchers had thought Enceladus was cold and geologically dead, but in 2005, NASA’s Cassini spacecraft spotted water vapor and icy particles erupting from the moon. [See Enceladus’ Curtain-like Jets in Action (Video)]
Scientists then determined that these outbursts originate from four “tiger stripes” — fractures on Enceladus’ south pole named after the cities Alexandria, Baghdad, Cairo and Damascus. These explosions are fed by a network of cracks that may carry water up from a giant subsurface ocean.
Initially, planetary scientist Joseph Spitale, of the Planetary Science Institute in Tucson, Arizona, and his colleagues thought these eruptions were concentrated jets. But now, they’ve found that these explosions may actually be giant curtains of vapor and ice.
“A lot of things that looked like jets were optical illusions — they were really curtains,” Spitale told Space.com.
The scientists analyzed Cassini images of what they thought were jets from Enceladus in order to determine where these eruptions come from and what might cause them.