Ceres features more than 130 bright areas, which researchers say is a type of magnesium sulfate. They hypothesize these bright, salt-rich areas resulted from asteroid impacts, which unearthed an ice-salt mixture. This further suggests that Ceres has a subsurface layer that contains briny water-ice. One particular crater called Occator contains the brightest material on Ceres. Researchers cite that views of Occator seem to show a diffuse haze near the surface that fills the floor of the crater and may be associated with observations of water vapor made by the Herschel Space Observatory in 2014. Further analysis is needed to test what is causing the haze to occur.
In the second study, the Dawn science team found evidence of ammonia-rich clays in Ceres’ composition. Ammonia ice would evaporate on Ceres today because the dwarf planet is too warm. But, if combined with other minerals, such as nitrogen which can be found near Neptune, the ammonia molecules could be stable. As a result, the researchers suggest two theories – a) Ceres originated in the outer solar system; or b) it formed close to its present position between Mars and Jupiter and incorporated materials that drifted in from the outer solar system.
Dawn recently reached its final orbital altitude at Ceres, approximately 240 miles from the surface, and is now taking images from this location. The data is certain to help researchers unlock more mysteries. To read more about the studies featured in Nature, click here.
All Images Credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA
Dawn's mission is managed by JPL for NASA's Science Mission Directorate in Washington. Dawn is a project of the directorate's Discovery Program, managed by NASA's Marshall Space Flight Center in Huntsville, Alabama. UCLA is responsible for overall Dawn mission science. Orbital ATK Inc., in Dulles, Virginia, designed and built the spacecraft. The German Aerospace Center, Max Planck Institute for Solar System Research, Italian Space Agency and Italian National Astrophysical Institute are international partners on the mission team. For a complete list of mission participants, visit: