+ NASA Homepage + NASA en Español + Marte en Español + Mars Home Third-Generation Mars Rover Dwarfs Predecessors - 05/12/08 Mars rovers appear to be shrinking with age! The biggest, baddest, newest rover being built is the Mars Science Laboratory rover (right). Read More >> All MSL Spotlights >> Mars Rovers Sharpen Questions About Livable Conditions Like salt used as a preservative, high concentrations of dissolved minerals in the wet, early-Mars environment known from discoveries by NASA's Opportunity rover may have thwarted any microbes from developing or surviving. >> Astronomers Monitor Asteroid to Pass Near Mars Astronomers funded by NASA are monitoring the trajectory of an asteroid estimated to be 164-feet wide that is expected to cross Mars' orbital path early next year. >> Alignment on December 24, 2007 This is a special day that happens only every 26 months when Earth is exactly between the Sun and Mars. Find out more about opposition and experiment with Mars and Earth in their orbits. >> Spectrometer on NASA Orbiter Maps Minerals at Possible Landing Sites The mineral-mapping instrument on NASA's Mars Reconnaissance Orbiter has been examining candidate landing sites for NASA's Mars Science Laboratory. >> more news >> Mars Science Laboratory Mission Animation + Freedom of Information Act + The President's Management Agenda + FY 2002 Agency Performance and    accountability report + NASA Privacy Statement, Disclaimer, and    Accessiblity Certification Last Updated: + Comments and Questions