The spacecraft has several major subsystems, almost all of which have backups (redundant systems) to ensure mission success just in case the first one fails. Mars Reconnaissance Orbiter was designed to be "single fault tolerant," meaning that if any one item fails, the spacecraft would still be able to complete the mission. This high level of reliability was very important since, once it was launched, Mars Reconnaissance Orbiter was forever out of reach of a service call!
| Instruments: |
tools for conducting science and other research experiments |
| Structures: |
for holding all of the engineering and science equipment |
| Mechanisms: |
for allowing some parts to point independently of the main spacecraft |
| Telecommunications: |
for radio communications between Earth and the spacecraft |
| Antennas: |
for sending and receiving data |
| Propulsion: |
for correcting the spacecraft's flight path and getting into Mars orbit |
| Command and Data-Handling Systems: |
for storing and processing data and commands |
| Guidance, Navigation, and Control Systems: |
for helping to guide the spacecraft to Mars and for keeping it oriented correctly |
| Thermal Systems: |
for maintaining proper temperatures in the extreme environment of space |
| Electrical Power: |
for providing electricity to the spacecraft |
