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It is currently in orbit about its second target, the dwarf planet Ceres.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.First, the Dawn mission can capture the earliest moments in the origin of the Solar System, granting an insight into the conditions under which these objects formed.Second, Dawn determines the nature of the building blocks from which the terrestrial planets formed, improving scientific understanding of this formation.The first working ion thruster was built by Harold R.Kaufman in 1959 at NASA's Glenn Research Center in Ohio.It is the first NASA exploratory mission to use ion propulsion, which enabled it to enter and leave the orbit of multiple celestial bodies.Previous multi-target missions using conventional drives, such as the Voyager program, were restricted to flybys.

Dawn is a space probe launched by NASA in September 2007 with the mission of studying two of the three known protoplanets of the asteroid belt, Vesta and Ceres.

It shows signs of a metallic core, a Mars-like density and lunar-like basaltic flows.

Available evidence indicates that both bodies formed very early in the history of the Solar System, thereby retaining a record of events and processes from the time of the formation of the terrestrial planets.

Finally, it contrasts the formation and evolution of two small planets that followed very different evolutionary paths, allowing scientists to determine what factors control that evolution.

With the propellant it carries, Dawn can perform a velocity change of more than 10 km/s over the course of its mission, far more than any previous spacecraft achieved with onboard propellant after separation from its launch rocket.

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