Lunar Prospector was a NASA/Ames spacecraft that orbited the Moon for a year (1998-1999). It measured the surface composition and gravity fields of the Moon from a polar orbit around 100 km in altitude, consequently discovering the existence of water ice on the permanently shadowed craters of the lunar poles. As it deliberately crashed onto the Moon at the end of its mission in 1999-Jul-31, it carried along with it are the ashes of the late Dr. Eugene Shoemaker.
How to install add-ons? Find out here.