NASA unveiled Monday, Feb. 2, 2004, this photograph of the Mars rover Opportunity's robotic arm as it stretched over the surface of Mars. NASA's Opportunity and its twin Spirit reached out their complex robotic arms to touch the surface of Mars on Monday, marking the first day of the joint $820 million mission when both unmanned spacecraft were in full swing. (AP Photo/NASA, JPL) print reply subscribe European Scientists Plan Mars Mission By JANE WARDELLAssociated Press Writer LONDON -- European scientists set out a route map Tuesday for manned missions to Mars that aims to land astronauts on the...