Description On June 10, 2003, a little rover named Spirit blasted off on a rocker headed for Mars. On July 7, 2003, a twin rover named Opportunity soared through the solar system with the same mission: to find out if Mars ever had water that could have supported life. A thrilling addition to the acclaimed Scientists In The Field series, The Mighty Mars Rovers tells the greatest space robot adventure of all time through the eyes and heart of Steven Squyres, professor of astronomy at Cornell Univeristy and lead scientist on the mission.