Spirit and Opportunity were solar-powered rovers landed on opposite sides of Mars conducting field geology and making atmospheric observations. Spirit landed on Jan. 4, 2004 on a plain inside Gusev Crater, a possible former lake in a giant impact crater
Delta II 7925
Cape Canaveral, Fl
Spirit was able to use it's rock abrasion tool to provide the first-ever look inside a rock on Mars at 'Adirondack'