Image credit: NASA/JPL-Caltech
Dawn Mission Discussion (Click to Listen to Audio)
NASA’s Dawn spacecraft is quickly approaching the end of its 10 week mission to study the asteroid Vesta.The spacecraft has been using a framed camera to return the closest photos of an asteroid ever seen. Vesta lies in the doughnut-like ring between Mars and Jupiter. Vesta is the second heaviest object in the asteroid belt. The images have shown many small craters some measuring 10 miles in diameter and up to 6 miles deep, small grooves and lineaments. Scientists hope that when the images have been further examined they will better understand the origins of the universe. Scientists have been most amazed at the discovery of a mountain three times taller than Mount Everest. Scientists have found that over half of the surface of Vesta is so cold and receives so little sunshine that ice could have survived there for billions of years (see image below).
Early examination of the information collected by Dawn including gravity mapping, gamma rays and neutron analysis along with the photos have led scientist to believe that the asteroid was formed by a large impact. Scientists feel that ice could be present beneath the surface at either pole. However, these poles see more sunlight than the equator. Temperatures at the pole are believed to hover near minus 200 degrees Fahrenheit. Scientists are using the mission to explore the role water played in early planet and asteroid formation.
Image Credit: Image credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA