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25-Jul-2016 22:58

The first working ion thruster was built by Harold R.

Previous multi-target missions using conventional drives, such as the Voyager program, were restricted to flybys.Dawn is the first spacecraft to orbit two extraterrestrial bodies, the first spacecraft to visit either Vesta or Ceres, and the first to visit a dwarf planet, arriving at Ceres in March 2015, a few months before New Horizons flew by Pluto in July 2015.