Enceladus: Active Ice World?

Enceladus, a tiny moon of Saturn, may be a world of water ice volcanoes actively resurfacing the surrounding terrain, according to planetary scientists. Surprised by tantalizing evidence of activity, scientists believe Enceladus may be the primary source of material for one of Saturn’s rings.

Data from Titan has shown that water ice in the outer solar system is as hard as rock and plays a role similar to the silicates that make up the rocky bodies of the inner solar system. A gravitational tug-and-pull between Enceladus and another Saturnian moon, Mimas, may provide enough energy to partially melt portions of its inner mantle or core, providing a ready supply of material to erupt onto the surface and out into space. The possible presence of ammonia in that water may act as antifreeze to create “molten” water.

The Cassini spacecraft was commanded to fly by Enceladus on Thursday, July 14, 2005 much closer than originally planned. The flyby distance was only 172 km (107 miles) compared to 1,000 km (622 miles) to provide the highest resolution images ever of this ice world. Cassini will not fly by Enceladus again until March 12, 2008.

The Cassini mission team is currently processing the data and the first images are beginning to show up in the “Raw Images” database on the website. The image above was taken when Cassini was approximately 207,529 kilometers away from Enceladus. Scientists will look at images that include resolutions as small as 40 meters per pixel to try to determine if the moon is currently active. The surface map to the right illustrates the regions that were to be covered by Cassini’s cameras and the expected resolution. The south pole of Enceladus was to have been imaged for the first time. Check back with The Frontier Channel from time to time over the next few days for the latest news about the Enceladus flyby.

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Richard Leis

Richard Leis is a fiction writer and poet, with his first published poem forthcoming later in 2017 from Impossible Archetype. His essays about fairy tales and technology have been published on Tiny Donkey. Richard is also the Downlink Lead for the High Resolution Imaging Science Experiment (HiRISE) team at the University of Arizona. He monitors images of the Martian surface taken by the HiRISE camera located on board the Mars Reconnaissance Orbiter in orbit around Mars and helps ensure they process successfully and are validated for quick release to the science community and public. Once upon a time, Richard wrote and edited the science and technology news and commentary website Frontier Channel, hosted the RADIO Frontier Channel podcast, and organized transhumanist clubs. Follow Richard on his website (richardleis.com), on Goodreads (richardleis), his Micro.blog (@richardleis), Twitter (@richardleisjr), and Facebook (richardleisjr).