The primary objectives for Apollo 16 were to explore a specific landing zone called the Descartes, and to inspect, survey and sample certain surface materials. The Descartes landing site is in a highlands region of the moon's southeast quadrant, characterized by hilly, grooved, furrowed terrain. They also implanted an ultraviolet stellar camera that took pictures of earth and sent them back and also took pictures of stars that weren’t able to be seen by earth. The crew consisted of John W. Young, Charles M. Duke Jr., and Thomas K. Mattingly II. The final thing they did before they headed back to Earth was to put a subsatellite up around the moon to survey new areas and take data. There were no major issues during this mission.