There now might be a definitive answer to a puzzle which has intrigued both scientists and the public for some time: What are those odd bright spots on the dwarf planet Ceres? A new study suggests they are a type of salt, originating from a subsurface layer of briny water-ice. Another study points to the existence of ammonia-rich clays on Ceres.
The Dawn spacecraft has sent back the best view yet of the main bright spots in Occator crater on the dwarf planet Ceres. The new image has a resolution of 140 meters (450 feet), and was taken from an altitude of 1,470 kilometres (915 miles).
The intriguing bright spots on dwarf planet/asteroid Ceres have been fascinating the public and scientists alike for the past few months, and now a new discovery might provide a valuable clue as to just what these spots are made of: the Dawn spacecraft has detected a periodic haze over the brightest spots in Occator crater.
This is the newest image of the main bright spots on dwarf planet Ceres taken by the Dawn spacecraft. It was taken on May 16, 2015, with a resolution of 700 metres (2,250 feet) per pixel. The second spot on the right can now be seen to be several smaller spots close together.
Some new views of Ceres were released today from the Dawn spacecraft, which include the now-famous mystery bright spots, as well as some new spots not seen before. The most prominent “double spot” as previously viewed, can now be seen to be multiple spots of various sizes.
The Dawn spacecraft has almost reached the dwarf planet Ceres, and a lot more detail can be seen as it gets closer. The odd bright spots which have puzzled scientists for a long time now can also be seen more clearly for the first time. What was thought to be one spot in this crater is now obviously two close together. Are they exposed ice or some other material? Are they related to possible cryovolcanoes? Dawn was 46,000 kilometers (29,000 miles) away when it took this image on February 18, 2015.
The Dawn spacecraft left behind the giant asteroid Vesta last September, and is now en route to the even bigger dwarf planet Ceres, but scientists are still busy studying all of the data that was sent back to Earth while it was orbiting Vesta for over a year. And as often happens while exploring these new worlds, they have made a surprising discovery: long, sinuous gullies on the walls of geologically younger craters.