Gli scienziati identificano la fonte di attività geologiche inaspettate sul pianeta Cerere

Esplora Cerere in laboratorio

Il pianeta nano Cerere è presente in questi rendering in falsi colori, che evidenziano le differenze nei materiali di superficie. Le immagini della navicella spaziale Dawn della NASA sono state utilizzate per creare un filmato della rotazione di Cerere, seguito da una vista dall’alto del cratere Occator, sede dell’area più luminosa di Cerere. Credito: NASA/JPL

La modellazione mostra come Cerere guida un’attività geologica inaspettata.

La nostra visione di Cerere è stata a lungo sfocata, secondo Scott King, geoscienziato al Virginia Tech College of Science. Nelle prime scansioni del telescopio dalla Terra c’era Cerere, un pianeta nano e il corpo più grande nella fascia degli asteroidi, che è l’area intermedia[{” attribute=””>Jupiter and

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.

Ceres Topography

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,

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

“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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