Landslides on Ceres reflect hidden ice

Landslides on Ceres reflect hidden ice

Recently a team of researchers from Georgia Institute of Technology found the evidence that Ceres retains a significant amount of water ice. The new findings published in the journal Nature Geoscience.

With the help of NASA’s Dawn spacecraft, scientists identified three different types of landslides, or flow features, on the Texas-sized asteroid.

First type of features they found is a relatively round and large and have thick toes at the end. They resembles to rock glaciers and icy landslides in Earth’s arctic. These kind features often found at high latitudes, which is also where the most ice is thought to reside near Ceres’ surface.

Second type of features are the most common of Ceres’ landslides and resembles to deposits left by avalanches on Earth. They are thinner and longer than Type I. They commonly found at mid latitudes. These kind of landslid named “Bart” because of its resemblance to the elongated head of Bart Simpson from TV’s “The Simpsons. Ceres’ Type III features appear to form when some of the ice is melted during impact events. These landslides at low latitudes are always found coming from large-impact craters. Georgia Tech Assistant Professor and Dawn Science Team Associate Britney Schmidt led the study. She believes it provides more proof that the asteroid’s shallow subsurface is a mixture of rock and ice. “Landslides cover more area in the poles than at the equator, but most surface processes generally don’t care about latitude,” said Schmidt, a faculty member in the School of Earth and Atmospheric Sciences. “That’s one reason why we think it’s ice affecting the flow processes. There’s no other good way to explain why the poles have huge, thick landslides; mid-latitudes have a mixture of sheeted and thick landslides; and low latitudes have just a few.” The study’s researchers were surprised at just how many landslides Ceres has in general. About 20 percent to 30 percent of craters greater than 6 miles (10 kilometers) wide have some type of landslide associated with them. Such widespread features formed by “ground ice” processes, made possible because of a mixture of rock and ice, have only been observed before on Earth and Mars. Based on the shape and distribution of landslides on Ceres, the authors estimate that the upper layers of Ceres may range from 10 percent to 50 percent ice by volume. “These landslides offer us the opportunity to understand what’s happening in the upper few kilometers of Ceres,” said Georgia Tech Ph.D. student Heather Chilton, a co-author on the paper. “That’s a sweet spot between information about the upper meter or so provided by the GRaND (Gamma Ray and Neutron Detector (GRaND) and VIR (Visible and Infrared Spectrometer) instrument data, and the tens of kilometers-deep structure elucidated by crater studies.” “It’s just kind of fun that we see features on this small planet that remind us of those on the big planets, like Earth and Mars,” Schmidt said. “It seems more and more that Ceres is our innermost icy world.” Source: Nature.com