The case of the missing craters
http://phys.org/news/2016-07-case-craters.html
When NASA's Dawn spacecraft arrived to orbit the dwarf planet Ceres in March 2015, mission
scientists expected to find a heavily cratered body generally resembling the protoplanet Vesta,
Dawn's previous port of call.
Instead, as the spacecraft drew near to Ceres, a somewhat different picture began to emerge:
Something has happened to Ceres to remove its biggest impact basins.
Now, writing in the online journal Nature Communications, a team of Dawn scientists led by
Simone Marchi of the Southwest Research Institute in Boulder, Colorado, reports on their computer
simulations of Ceres' history. These suggest that Ceres has experienced significant geological
evolution, possibly erasing the large basins.
![](http://cdn.phys.org/newman/gfx/news/hires/2016/thecaseofthe.jpg)