Explore This SectionScienceDawnCeres Neutron Counts Reflect...Solar System ResourcesCurated Resource PackagesSolar System Home Ceres Neutron Counts Reflect Hydrogen AbundanceMarch 22, 2016 Ceres' Haulani Crater is shown in these views from NASA's Dawn spacecraft. These views reveal variations in the region's brightness, mineralogy and temperature at infrared wavelengths.