| A mission involving three gliders would explore the composition and stratigraphy of the walls of Valles Marineris in ways not possible for orbiters and landers. |
| This smart software can be used on all kinds of spacecraft, including orbiters, landers and rovers. |
| They were extensively photographed by lunar orbiters and Apollo astronauts. |
| The program would start with lunar orbiters, which would be followed by landers and rovers, and eventually sample return missions. |
| Martian orbiters can use aerobraking to reduce the amount of propellant they need. |
| Each satellite would carry a shortrange UHF transceiver to communicate with landers and orbiters near Mars and a longrange radio to relay information back to Earth. |
