A Close Up or Martian Soil . ... Credit Copyright: Mars Exploration Rover Mission , JPL , NASA Explanation: Make your background the closest image of Mars yet. The Spirit Rover currently rolling on Mars has taken the highest resolution image to date of another planet. ... As more images come in and as the Spirit Rover continues to explore Mars, more information about the unusual floor of Gusev Crater are likely to emerge. ... NASA Web Site Statements, Warnings, and Disclaimers . ...