Scheduled for launch in 2003, two NASA rovers will set out to explore Mars and determine whether water ever existed on the planet. This is the home page of the Mars rovers, and it has a great deal of information about the specifications and technology of the missions. Detailed descriptions of the scientific instruments equipped on each rover are provided. Color diagrams show the main components of the rovers. A special section is dedicated to the camera systems, which are used for hazard avoidance, navigation, image capture, and microscopic imaging. There are also overviews of the space craft and launch vehicles that will transport the rovers to Mars.