Apollo 16: Exploring Plum Crater . ... Credit Copyright: NASA , Apollo 16 , John W. Young Explanation: Apollo 16 spent three days on Earth's Moon in April 1972. The fifth lunar landing mission out of six, Apollo 16 was famous for deploying and using an ultraviolet telescope as the first lunar observatory , and for collecting rocks and data on the mysterious lunar highlands . ... Duke stands by Plum Crater while the Lunar Roving Vehicle waits parked in the background. ... NASA Official: Jay Norris. ...