Buzz Aldrin shot down two MiG-15 aircraft. After earning a Sc.D. degree in astronautics from the Massachusetts Institute of Technology, Aldrin was selected as a member of NASA's Astronaut Group 3, making him the first astronaut with a doctoral degree. His doctoral thesis was "Line-of-Sight Guidance Techniques for Manned Orbital Rendezvous", earning him the nickname "Dr. Rendezvous" from fellow astronauts. His first space flight was Gemini 12 during which he spent over five hours on extravehicular activity (EVA) outside the spacecraft. Aldrin set foot on the Moon at 03:15:16 on July 21, 1969 (UTC), nine minutes after Armstrong first touched the surface,
Buzz Aldrin after two hours and six minutes. A third, 55-minute standup EVA was conducted on November 14, during which Aldrin took photographs, conducted experiments, and discarded some unneeded items. On November 15, the crew initiated the automatic reentry system and splashed down in the Atlantic Ocean, from whence they were picked up by a helicopter which took them to the awaiting aircraft carrier . After the mission, his wife realized he had fallen into a depression, something she had not seen before. Lovell and Aldrin were assigned to an Apollo crew with Neil Armstrong as Commander, Lovell as Command Module Pilot