Space

Scientists Identify the Source of the Planet Ceres’ Unexpected Geological Activity

Exploring Ceres in Labs

Dwarf planet Ceres is shown in these false-color renderings, which highlight differences in surface materials. Images from NASA’s Dawn spacecraft were used to create a movie of Ceres rotating, followed by a flyover view of Occator Crater, home of Ceres’ brightest area. Credit: NASA/JPL

Modeling reveals how Ceres powers unexpected geologic activity.

According to Scott King, a geoscientist at the Virginia Tech College of Science, our view of Ceres has been hazy for a very long time. In previous telescopic scans from Earth, Ceres, a dwarf planet and the largest body in the asteroid belt, which is the area between Jupiter and Mars where hundreds of thousands of asteroids are scattered, Ceres had no distinguishable surface features.

Then, in 2015, the hazy orb that was Ceres came into view. For scientists like King, the sight was breathtaking. The NASA Dawn mission’s data and images provided a better view of the surface, including its composition and structures, revealing unanticipated geologic activity.

In prior observations, scientists had seen the overall size of Ceres. It was thought to be inactive since it was so tiny. Instead, Dawn observed a massive plateau on one side of Ceres that encompassed a portion of the dwarf planet, comparable to what a continent might take up on Earth. Surrounding it were fractures in rocks clustered in one location. Additionally, there were obvious signs of an ocean world, including deposits all over the surface where minerals had condensed when water evaporated. These deposits were the sign of a freezing ocean.

King, a professor at the Department of Geosciences who focuses mostly on studying larger bodies like planets, was curious as to how a body as small as Ceres could produce the heat required to support that level of geological activity and explain for the surface features observed by Dawn.

This illustration models the topography (in meters) of Ceres from NASA’s Dawn project, with green and blue colors. Some of the dwarf planet’s major craters are labeled. A ruler is below the image of Ceres showing, in meters, negative 8,000 to positive 8,000. Credit: Virginia Tech

Through modeling, he and a team of scientists from multiple universities as well as the United States Geological Survey and the Planetary Science Institute found that the decay of radioactive elements within Ceres’s interior could keep it active. Their findings were recently published in American Geophysical Union Advances.

King’s study of big planets such as Earth, Venus, and Mars had always shown him that planets start out hot. The collision between objects that form a planet creates that initial heat. Ceres, by contrast, never got big enough to become a planet and generate heat the same way, King said. To learn how it could still generate enough heat to power geologic activity, he used theories and computational tools previously applied to bigger planets to study Ceres’s interior, and he looked for evidence that could support his models in data returned by the Dawn mission.

The team’s model of the dwarf planet’s interior showed a unique sequence: Ceres started out cold and heated up because of the decay of radioactive elements such as uranium and thorium — which was alone enough to power its activity — until the interior became unstable.

“What I would see in the model is, all of a sudden, one part of the interior would start heating up and would be moving upward and then the other part would be moving downward,” King said.

That instability could explain some of the surface features that had formed on Ceres, as revealed by the Dawn mission. The large plateau had formed on only one side of Ceres with nothing on the other side, and the fractures were clustered in a single location around it. The concentration of features in one hemisphere signaled to King that instability had occurred and had left a visible impact.

“It turned out that you could show in the model that where one hemisphere had this instability that was rising up, it would cause extension at the surface, and it was consistent with these patterns of fractures,” King said.

Based on the team’s model, Ceres didn’t follow a planet’s typical pattern of hot first and cool second, with its own pattern of cool, hot, and cool again. “What we’ve shown in this paper is that radiogenic heating all on its own is enough to create interesting geology,” King said.

He sees similarities to Ceres in the moons of Uranus, which a study commissioned by NASA and the National Science Foundation recently deemed a high priority for a major robotic mission. With additional improvements to the model, he looks forward to exploring their interiors as well.

“Some of these moons are not too different in size from Ceres,” King said. “I think applying the model would be really exciting.”

Reference: “Ceres’ Broad-Scale Surface Geomorphology Largely Due To Asymmetric Internal Convection” by Scott D. King, Michael T. Bland, Simone Marchi, Carol A. Raymond, Christopher T. Russell, Jennifer E. C. Scully and Hanna G. Sizemore, 17 May 2022, AGU Advances.
DOI: 10.1029/2021AV000571

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  • Dark matter is an unnecessary kluge. The current model will be upended by the JWST. It will be difficult for so many people who have invested in this dead end since Hubble to concede, but it’s coming.

  • As long as it's not due to the presence of an alien proto-molecule, I'm glad Ceres isn't completely dead!

  • Or Ceres is the final remnant of the core of the planet that was once formed by the debris that makes up the asteroid belt.

  • I think they're overlooking the more obvious source.

    The Earth/Moon system is a double planet, their ratio of size is far too close compared to any other planet & its satellites. The Moon is supposed to have been spawned from Earth in a collision a few billion years ago, and wven merged with another body in orbit with it (essentially two large blobs of molten Earth) creating the greatly different features in its hemispheres.

    Well, in a collision of that magnitude, do you think Earth would have stayed in its same orbit, or much more likely was knocked from its original orbit to eventually become relatively stable in this one.

    Guess where that orbit probably was? Between Mars & Jupiter. The Earth would have started out much larger than it is, some crustal fragments would have carried water with them. The missing mass became the Moon, asteroids & the many asteroid like moonlets of other planets and some likely crashed into the Sun or other planets. Now a few billion years later much of that has been vacuumed up. But some of the larger pieces likely had a lot of initial heat and it may well take a very long tine to dissipate from a larger body, especially if it gets some tidal squeezing from Jupiter/Sun.

  • If we fine a way to move Ceres to be the Vinuse moon ,it would be a big change for its atmosphere?

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Virginia Tech

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