Artist's concept of possible exploration programs. Unmanned spacecraft will precede the first human exploration missions to the surface of Mars to assess landing sites and conduct scientific measurements in the atmosphere and on the surface. The spacecraft depicted in this picture has a vision system to view the possible landing sites as it approaches and the intelligence to select a landing site. This technology can be used on both unmanned as well as the manned mission to guide the spacecraft safely to the surface. Artwork by Pat Rawlings, of SAIC. (NASA Media Archives). Buy this as a superb wall poster, a canvas print or a framed print.