The model analyzes tiny oscillations - or wobbles - in the spin of a moon as it orbits Uranus. These wobbles reveal the distribution of water, ice, and rock beneath the surface. A significant wobble indicates the presence of a liquid ocean beneath an icy crust, while minimal wobble suggests a solid interior. Combined with gravity data, the model can estimate ocean depth and ice thickness, offering mission planners vital insights.
Doug Hemingway, a planetary scientist at UTIG and the model's developer, emphasized the potential implications of the findings. "Discovering liquid water oceans inside the moons of Uranus would transform our thinking about the range of possibilities for where life could exist," he said.
Uranus, classified as an ice giant along with Neptune, is part of a planetary group that astronomers have identified as the most common type of exoplanet. If its moons are proven to have liquid water, it could signify that similar life-supporting environments exist throughout the galaxy.
UTIG's research, published in 'Geophysical Research Letters', is designed to assist NASA in preparing for its Uranus mission. By analyzing how Uranus's tidally locked moons oscillate as they orbit, scientists can refine techniques to identify potential oceans. Even slight deviations - such as a few hundred feet of rotational movement - could indicate the presence of a liquid interior. This method was successfully used to confirm an ocean within Saturn's moon Enceladus.
Hemingway's theoretical work assessed five of Uranus's moons, including Ariel, which could have an ocean approximately 100 miles deep beneath a 20-mile-thick ice shell if its wobble measures around 300 feet. Detecting such minute variations requires spacecraft equipped with high-resolution imaging or other enhanced detection tools.
Krista Soderlund, a UTIG research associate professor not involved in the study, highlighted the importance of mission preparedness. "It could be the difference between discovering an ocean or finding we don't have that capability when we arrive," she said. Soderlund has worked on Uranus mission concepts with NASA and is part of the science team for the Europa Clipper mission, which carries UTIG-developed ice-penetrating radar.
Future advancements in the model will integrate data from additional instruments to further enhance understanding of the moons' internal structures, Hemingway explained. Such refinements could pave the way for a detailed exploration of Uranus's moons, advancing the search for extraterrestrial life.
Research Report:Looking for Subsurface Oceans Within the Moons of Uranus Using Librations and Gravity
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