Dawn, NASA's mission to the Asteroid Belt, comes to an end

Dawn, the little spacecraft that could, has ended its mission into the asteroid belt.  Launched in September 2007, it is the first probe to orbit one celestial body and then leave to orbit another one.  Dawn arrived at Vesta in July 2011 and studied the protoplanet for 14 months.

Dawn left Vesta and traveled to Ceres, arriving in March 2015, where it remains.  It missed several scheduled communications and NASA has concluded it has run out of hydrazine, the fuel that helps the craft keep its antennae pointed toward Earth and its solar panels to the sun.

Its mission lasted three years longer than anticipated.

Dawn achieves orbit around protoplanet Vesta, 2011

NASA's Dawn probe, launched in 2007, entered orbit around the "protoplanet" Vesta in the asteroid belt July 16, 2011.  It is the first spacecraft to visit Vesta and Ceres, a dwarf planet where Dawn is currently orbiting.

A protoplanet is a large planet embryo that originated...you know what?  Here's the description on Wikipedia and you can figure it out, because I sure can't.

Vesta is the second-largest and second-most-massive object in the asteroid belt behind Ceres.  It has an elliptical shape with diameters from 550 km x 462 km and its year is 3.6 Earth-years.

In September 2012, Dawn left Vesta and is now in orbit around Ceres.

Dawn arrives at Ceres 2015

Ceres as seen by Dawn

The spacecraft Dawn arrived at the minor planet Ceres March 6, 2015.  Launched September 27, 2007, Dawn made a flyby of Mars on its way to the asteroid belt, arriving at the minor planet Vesta July 6, 2011.  After a 14 month study, Dawn headed toward Ceres, the largest object between Mars and Jupiter.  Right away, Dawn started sending back stunning pictures of the minor planet, showing mysterious bright spots on the surface.

Dawn will continue to study Ceres until its fuel runs out later this year.  It will remain in a stable orbit around the minor planet.

Dawn, spacecraft to the asteroid belt, launched 2007

Dawn, NASA's spacecraft to visit dwarf planets Ceres and Vesta, formerly known as asteroids, in the asteroid belt was launched September 27, 2007.  After testing its boosters in orbit above Earth and then receiving a gravity boost from Mars, Dawn entered orbit above Vesta June 16, 2011.  After exploring Vesta for a little over a year, it headed toward Ceres.

Dawn reached Ceres in December 2014 and discovered 'light' spots on the surface.  NASA scientists concluded that salt-rich water might have welled up to the surface of the dwarf planet.

NASA originally planned to have Dawn visit a third body, Adeona, but decided the spacecraft would be best used studying Ceres.  Dawn's mission was extended for one year in June 2017 and it has enough fuel to last until the end of 2018.  At that time, NASA may put it into an orbit which will avoid impact with Ceres.  They do not want to contaminate any of the asteroids.