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 and students flew a modified F-104 Starfighter to the edge of space. Fellow Group 3 astronaut and moonwalker Alan Bean considered him well-qualified for the job. Aldrin did not get along well with his superior, Brigadier General Robert M. White, who had earned his astronaut wings flying the X-15. Aldrin's celebrity status led to people to defer to him more than the higher-ranking general. He was hospitalized for depression. His mother committed suicide in May 1968. Aldrin feared that his fame after Gemini 12 contributed. Her father had also committed suicide, and he believes he inherited depression from them. There