This is an Long after the Mars sample return rover has fulfilled its mission requirements, two explorers replace the robot's worn wheel motors. The refurbished machine, instead of operating autonomously, can be teleoperated by orbital or surface controllers. Note: NASA currently has no formal plans for a human expedition to Mars or the Moon. This image and others displayed may not reflect the hardware and overall concept of possible visits to either of those celestial bodies. However, the art work represented here serves as a comprehensive study of various concepts and ideas developed as possibilities over a period of years.