+ NASA Homepage + NASA en Español + Marte en Español + Mars Home + MER Home Spacecraft Mars Artwork Craters Martian Terrain Spacecraft Return to Spacecraft index Hi Res JPG (2 MB) Mars Exploration Rover Makes Progress One of two Mars Exploration Rovers sits inside its cruise stage waiting to undergo environmental testing at NASA's Jet Propulsion Laboratory. In this photo, engineers are preparing the rover for vibration testing to ensure that it can undergo the rigors of launch and entry into the martian atmosphere. The rovers are scheduled to launch next spring and will arrive at Mars in January 2004. + Freedom of Information Act + The President's Management Agenda + FY 2002 Agency Performance and    accountability report + NASA Privacy Statement, Disclaimer, and    Accessiblity Certification + Freedom to Manage Last Updated: + Comments and Questions