The late Leonard Nimoy, "Mr. Spock", narrated a neat video about the Dawn mission in 2007. It explains what the mission would do and how the ion propulsion engine works.
Sky Guy in VA
|Robert Mase, right, project manager for the Dawn mission at Nasa’s Jet Propulsion Laboratory, speaks at news conference, with Carol Raymond, deputy project scientist at JPL, left, at JPL in Pasadena on Monday, March 2, 2015. NASA’s Dawn spacecraft is scheduled to slip into orbit around the dwarf planet Ceres on Friday, the last stop in a nearly eight-year journey. (AP Photo/Nick Ut)|