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Surf’s up! Liquid methane waves on Saturn moon Titan may erode shores of alien lakes and rivers

June 21, 2024
in Science
Surf’s up! Liquid methane waves on Saturn moon Titan may erode shores of alien lakes and rivers
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a green moon with streaks and pools of darker green on its surface

Titan as seen by the Cassini spacecraft.
(Image credit: NASA)

Nearly 20 years ago, the Cassini probe and its Huygens lander peeked under the hazy atmosphere of Saturn’s largest moon Titan and gave us our first glimpse of the moon’s familiarly strange surface. 

Cassini-Huygens found that noxious liquids like methane and ethane form a very Earthlike patchwork of streams, rivers, and even seas as large as the Great Lakes.

Now, scientists poring over imagery from Cassini have determined that Titan may very well have another thing familiar to Earth’s mariners: waves. Those scientists believe those waves may be responsible for eroding and reshaping Titan’s lakeshores.

Related: Largest sea on Saturn’s mysterious moon Titan could be more than 1,000 feet deep

First, the researchers simulated how shorelines would change under different conditions: Experiencing no erosion whatsoever; experiencing erosion from battering waves; and experiencing erosion from liquid slowly eating away at the lakeshore’s material. Then, they corroborated their simulation results to what Cassini saw. 

Titan’s thick clouds occlude a visible-light view of the moon’s surface, but Cassini came equipped with a radar instrument that allowed it to map Titan’s mountains, canyons, and, indeed, shorelines. The researchers picked out Cassini traces of four particularly large Titanian lakes — the biggest of which, Kraken Mare, is similar in size to Earth’s largest lake, the Caspian Sea.

The researchers then reran their simulations with the shapes of those four lakes to determine which of the three processes produced shorelines that looked the most similar to what Cassini saw. Wave-driven erosion came closest.

Breaking space news, the latest updates on rocket launches, skywatching events and more!

an orange strip of a moon's surface is dotted with large dark blue lakes in a false-color image

Liquid lakes on Titan as seen by the Cassini-Huygens mission. (Image credit: NASA/JPL-Caltech/USGS)

These results are the newest volley in an ongoing debate over whether Titan has waves or not. “Some people who tried to see evidence for waves didn’t see any, and said, ‘These seas are mirror-smooth,'” said Rose Palermo, a geologist at the U.S. Geological Survey and one of the researchers behind this study, in a statement. “Others said they did see some roughness on the liquid surface but weren’t sure if waves caused it.”

If it is true that Titan has waves, then it’s likely that they are strewn up by Titanian winds. Palermo and co-authors now want to study the waves to learn more about those winds — how strong they are and where they’re blowing.

The authors published their work in the journal Science Advances on June 19. 

Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at: [email protected].

Rahul Rao is a graduate of New York University’s SHERP and a freelance science writer, regularly covering physics, space, and infrastructure. His work has appeared in Gizmodo, Popular Science, Inverse, IEEE Spectrum, and Continuum. He enjoys riding trains for fun, and he has seen every surviving episode of Doctor Who. He holds a masters degree in science writing from New York University’s Science, Health and Environmental Reporting Program (SHERP) and earned a bachelors degree from Vanderbilt University, where he studied English and physics. 

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