Dawn's goal is to characterize the conditions and processes of the solar system's earliest epoch by investigating in detail two of the largest protoplanets remaining intact since their formations. Ceres and Vesta reside in the extensive zone between Mars and Jupiter together with many other smaller bodies, called the asteroid belt. Each has followed a very different evolutionary path constrained by the diversity of processes that operated during the first few million years of solar system evolution.
more Info, Dawn Homepage
http://www-ssc.igpp.ucla.edu/dawn/index.html
or at NASA
http://www.nasa.gov/mission_pages/dawn/main/index.html
and for Info, what is a ION PROPULSION
http://www-ssc.igpp.ucla.edu/dawn/spacecraft.html
and
http://science.nasa.gov/newhom...ines/prop06apr99_2.htm
Greetings from Germany NRW
Sir Ulli
more Info, Dawn Homepage
http://www-ssc.igpp.ucla.edu/dawn/index.html
or at NASA
http://www.nasa.gov/mission_pages/dawn/main/index.html
and for Info, what is a ION PROPULSION
http://www-ssc.igpp.ucla.edu/dawn/spacecraft.html
and
http://science.nasa.gov/newhom...ines/prop06apr99_2.htm
Greetings from Germany NRW
Sir Ulli