The two identical rovers - Spirit and Opportunity - are the scientist's eyes, arms and legs on Mars. Their instruments have helped to reveal Mars as a warm, wet world that could have supported life.

Major Systems On The Rovers

1. Camera Mast: five digital cameras that provide infrared, stereoscopic and panoramic images.
2. Low-gain antenna for transmitting and receiving
3. Solar panels providing power to the vehicle
4. High-gain antenna for high volume data transfer
5. Robot Arm with four instruments, including a drill, a microscope and two spectrometers for analysing rock and soil.
6. Rocker-bogie mobility system ("suspension")
7. Six-wheel drive system with independent steering and motor drives.