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Cool image time! With the Dawn spacecraft now swooping with 22 miles of the surface of Ceres every 27 hours, the science team has assembled a spectacular oblique image of Cerealia Facula, one of the dwarf planet’s bright spots thought to be brine deposits that at some point erupted up from below the surface.
The image on the right, reduced in resolution to show here, shows that mosaic. If you click on the image you can see the full resolution version. From the image webpage:
This mosaic of Cerealia Facula combines images obtained from altitudes as low as 22 miles (35 km) above Ceres’ surface. The mosaic is overlain on a topography model based on images obtained during Dawn’s low altitude mapping orbit (240 miles or 385 km altitude). No vertical exaggeration was applied.
There are a lot of intriguing details in the full resolution image. I have highlighted one feature, indicated by the white box and shown in full resolution below.
The white material very clearly appears to be a flow going downhill, though the feature has some puzzling aspects. For example, the edges of the deposit are its brightest, as if the center area is the oldest and has faded with time. Moreover, the bottom edges are the brightest of all, and the faded center area seems depressed relative to its edges.
We know that many of these bright spots are in depressions. It has been theorized that they might have once been brine volcanoes that after the eruptions died out the volcanoes slumped, collapsing into a sink.
This detail as well as the full image of the entire bright spot suggests something different to me. Instead of a brine volcano, it appears that the seep comes up slowly from below, and causes a sink, not a volcano, as it does so. The detail shows that new material does not necessarily break the surface initially, but seeps downhill to break out at the edges, thus creating those brightest sections.
All guesses on my part. Greater certainty of the make-up of the white material and the surrounding darker material, combined with a lot of calculations based Ceres’s weak gravity, will be needed to get a better understanding of what is happening here.