Aldrin initially applied to join the astronaut corps when NASA's
Astronaut Group 2 was selected in 1962. His application was rejected on the grounds that he was not a test pilot. Aldrin was aware of the requirement and asked for a waiver but the request was turned down. On May 15, 1963, NASA announced another round of selections, this time with the requirement that applicants had either test pilot experience or 1,000 hours of flying time in jet aircraft. Aldrin had over 2,500 hours of flying time, of which 2,200 was in jets. His selection as one of fourteen members of NASA's
Astronaut Group 3 was announced on October 18, 1963. This made him the first astronaut with a doctoral degree which, combined with his expertise in orbital mechanics, earned him the nickname "Dr. Rendezvous" from his fellow astronauts. Although Aldrin was both the most educated and the rendezvous expert in the astronaut corps, he was aware that the nickname was not always intended as a compliment. Upon completion of initial training, each new astronaut was assigned a field of expertise; in Aldrin's case, it was mission planning, trajectory analysis, and flight plans.
Gemini program Jim Lovell and Aldrin were selected as the backup crew of
Gemini 10, commander and pilot respectively. Backup crews usually became the prime crew of the third following mission, but the last scheduled mission in the program was
Gemini 12. The February 28, 1966, deaths of the
Gemini 9 prime crew,
Elliot See and
Charles Bassett, in an
air crash, led to Lovell and Aldrin being moved up one mission to backup for Gemini 9, which put them in position as prime crew for Gemini 12. They were designated its prime crew on June 17, 1966, with
Gordon Cooper and
Gene Cernan as their backups.
Gemini 12 spacecraft.|alt=Astronaut performing EVA Initially, Gemini 12's mission objectives were uncertain. As the last scheduled mission, it was primarily intended to complete tasks that had not been successfully or fully carried out on earlier missions. While NASA had successfully performed rendezvous during Project Gemini, the
gravity-gradient stabilization test on
Gemini 11 was unsuccessful. NASA also had concerns about
extravehicular activity (EVA). Cernan on Gemini9 and
Richard Gordon on Gemini11 had suffered from fatigue carrying out tasks during EVA, but
Michael Collins had a successful EVA on Gemini 10, which suggested that the order in which he had performed his tasks was an important factor. It therefore fell to Aldrin to complete Gemini's EVA goals. NASA formed a committee to give him a better chance of success. It dropped the test of the Air Force's astronaut maneuvering unit (AMU) that had given Gordon trouble on Gemini11 so Aldrin could focus on EVA. NASA revamped the training program, opting for underwater training over
parabolic flight. Aircraft flying a parabolic trajectory had given astronauts an experience of weightlessness in training, but there was a delay between each parabola which gave astronauts several minutes of rest. It also encouraged performing tasks quickly, whereas in space they had to be done slowly and deliberately. Training in a viscous, buoyant fluid gave a better simulation. NASA also placed additional handholds on the capsule, which were increased from nine on Gemini9 to 44 on Gemini12, and created workstations where he could anchor his feet. work station in November 1966|alt=Astronaut performing EVA Gemini 12's main objectives were to rendezvous with a target vehicle, and fly the spacecraft and target vehicle together using gravity-gradient stabilization, perform docked maneuvers using the Agena propulsion system to change orbit, conduct a tethered stationkeeping exercise and three EVAs, and demonstrate an automatic reentry. Gemini12 also carried 14 scientific, medical, and technological experiments. It was not a trailblazing mission; rendezvous from above had already been successfully performed by Gemini 9, and the tethered vehicle exercise by Gemini 11. Even gravity-gradient stabilization had been attempted by Gemini 11, albeit unsuccessfully. Gemini12 was launched from
Launch Complex 19 at
Cape Canaveral on 20:46 UTC on November 11, 1966. The
Gemini Agena Target Vehicle had been launched about an hour and a half before. and entered Earth orbit twelve minutes later. After one and a half orbits, the
S-IVB third-stage engine pushed the spacecraft onto its trajectory toward the Moon. About thirty minutes later, the
transposition, docking, and extraction maneuver was performed: this involved separating the
command module Columbia from the spent S-IVB stage; turning around; and docking with, and extracting, the
Lunar Module Eagle. The combined spacecraft then headed for the Moon, while the S-IVB stage continued on a trajectory past the Moon. are reflected in his visor. to its lunar landing, establishing
Tranquility Base, July 20, 1969. On July 19 at 17:21:50 UTC, Apollo11 passed behind the Moon and fired its service propulsion engine to enter
lunar orbit. In the thirty orbits that followed, the crew saw passing views of their landing site in the southern
Sea of Tranquillity about southwest of the crater
Sabine D. At 12:52:00 UTC on July 20, Aldrin and Armstrong entered
Eagle, and began the final preparations for lunar descent. At 17:44:00
Eagle separated from the
Columbia. Collins, alone aboard
Columbia, inspected
Eagle as it pirouetted before him to ensure the craft was not damaged and that the landing gear had correctly deployed. Throughout the descent, Aldrin called out navigation data to Armstrong, who was busy piloting the
Eagle. Five minutes into the descent burn, and above the surface of the Moon, the
LM guidance computer (LGC) distracted the crew with the first of several unexpected alarms that indicated that it could not complete all its tasks in real time and had to postpone some of them. Due to the 1202/1201 program alarms caused by spurious rendezvous radar inputs to the LGC, Armstrong manually landed the
Eagle instead of using the computer's autopilot. The
Eagle landed at 20:17:40 UTC on Sunday July 20 with about 25 seconds of fuel left. As a
Presbyterian elder, Aldrin was the first and only person to hold a religious ceremony on the Moon. He radioed Earth: "I'd like to take this opportunity to ask every person listening in, whoever and wherever they may be, to pause for a moment and contemplate the events of the past few hours, and to give thanks in his or her own way." Using a kit given to him by his pastor, he took
communion and read Jesus's words from the
New Testament's John 15:5, as Aldrin records it: "I am the vine. You are the branches. Whoever remains in me, and I in him, will bear much fruit; for you can do nothing without me." But he kept this ceremony secret because of a lawsuit over the
reading of Genesis on Apollo 8. In 1970 he commented: "It was interesting to think that the very first liquid ever poured on the Moon, and the first food eaten there, were communion elements." On reflection in his 2009 book, Aldrin said, "Perhaps, if I had it to do over again, I would not choose to celebrate communion. Although it was a deeply meaningful experience for me, it was a Christian sacrament, and we had come to the moon in the name of all mankind – be they
Christians,
Jews,
Muslims,
animists,
agnostics, or
atheists. But at the time I could think of no better way to acknowledge the enormity of the Apollo11 experience than by giving thanks to God." Aldrin shortly hit upon a more universally human reference on the voyage back to Earth by publicly broadcasting his reading of the
Old Testament's Psalm 8:3–4, as Aldrin records: "When I considered the heavens, the work of Thy fingers, the moon and the stars which Thou hast ordained, what is man that Thou art mindful of him." Photos of these liturgical documents reveal the conflict's development as Aldrin expresses faith. |thumb Preparations for the EVA began at 23:43. Once Armstrong and Aldrin were ready to go outside,
Eagle was depressurized, and the hatch was opened at 02:39:33 on July 21. Aldrin set foot on the Moon at 03:15:16 on July 21, 1969 (UTC), nineteen minutes after Armstrong first touched the surface. Armstrong and Aldrin became the first and second people, respectively, to walk on the Moon. Aldrin's first words after he set foot on the Moon were "Beautiful view", to which Armstrong asked "Isn't that something? Magnificent sight out here." Aldrin answered, "Magnificent desolation." Aldrin and Armstrong had trouble erecting the
Lunar Flag Assembly, but with some effort secured it into the surface. Aldrin saluted the flag while Armstrong photographed the scene. Aldrin positioned himself in front of the video camera and began experimenting with different locomotion methods to move about the lunar surface to aid future moonwalkers. During these experiments, President Nixon called the duo to congratulate them on the successful landing. Nixon closed with, "Thank you very much, and all of us look forward to seeing you on the
Hornet on Thursday." Aldrin replied, "I look forward to that very much, sir." After the call, Aldrin began photographing and inspecting the spacecraft to document and verify its condition before their flight. Aldrin and Armstrong then set up a
seismometer, to detect moonquakes, and a
laser beam reflector. While Armstrong inspected a crater, Aldrin began the difficult task of hammering a metal tube into the surface to obtain a core sample. Most of the iconic photographs of an astronaut on the Moon taken by the Apollo11 astronauts are of Aldrin; Armstrong appears in just two color photographs. "As the sequence of lunar operations evolved," Aldrin explained, "Neil had the camera most of the time, and the majority of the pictures taken on the Moon that include an astronaut are of me. It wasn't until we were back on Earth and in the Lunar Receiving Laboratory looking over the pictures that we realized there were few pictures of Neil. My fault perhaps, but we had never simulated this during our training." Aldrin reentered
Eagle first but claims, before ascending the module's ladder he became the first person to urinate on the Moon. With some difficulty they lifted film and two sample boxes containing of lunar surface material to the hatch using a flat cable pulley device. Armstrong reminded Aldrin of a bag of memorial items in his sleeve pocket, and Aldrin tossed the bag down. It contained a mission patch for the
Apollo 1 flight that Ed White never flew due to
his death in a cabin fire during the launch rehearsal; medallions commemorating
Yuri Gagarin, the first man in space (who had
died the previous year in a test flight accident), and
Vladimir Komarov, the first man to
die in a space flight, and a silicon disk etched with goodwill messages from 73 nations. After transferring to LM
life support, the explorers lightened the ascent stage for the return to lunar orbit by tossing out their backpacks, lunar overshoes, an empty
Hasselblad camera, and other equipment. The hatch was closed again at 05:01, and they repressurized the lunar module and settled down to sleep. in orbit above the Moon, photo by
Michael Collins At 17:54 UTC, they lifted off in
Eagle ascent stage to rejoin Collins aboard
Columbia in lunar orbit. After rendezvous with
Columbia, the ascent stage was jettisoned into lunar orbit, and
Columbia made its way back to Earth. It splashed down in the Pacific east of
Wake Island at 16:50 UTC (05:50 local time) on July 24. The total mission duration was 195 hours, 18 minutes, 35 seconds. Bringing back
pathogens from the lunar surface was considered a possibility, albeit remote, so divers passed biological isolation garments (BIGs) to the astronauts, and assisted them into the life raft. The astronauts were winched on board the recovery helicopter, and flown to the aircraft carrier , where they spent the first part of the Earth-based portion of 21 days of quarantine. On August 13, the three astronauts rode in ticker-tape parades in their honor in New York and Chicago, attended by an estimated six million people. An official
state dinner that evening in Los Angeles celebrated the flight. President
Richard Nixon honored each of them with the highest American civilian award, the
Presidential Medal of Freedom (with distinction). On September 16, 1969, the astronauts addressed a
joint session of Congress where they thanked the representatives for their past support and implored them to continue funding the space effort. The astronauts embarked on a 38-day world tour on September 29 that brought the astronauts to 22 foreign countries and included visits with leaders of multiple countries. The last leg of the tour included Australia, South Korea, and Japan; the crew returned to the US on November 5, 1969. After Apollo 11, Aldrin was kept busy giving speeches and making public appearances. In October 1970, he joined Soviet cosmonauts
Andriyan Nikolayev and
Vitaly Sevastyanov on their tour of the NASA space centers. He was also involved in the design of the
Space Shuttle. With the Apollo program coming to an end, Aldrin, now a
colonel, saw few prospects at NASA, and decided to return to the Air Force on July 1, 1971. During his NASA career, he had spent 289 hours and 53 minutes in space, of which 7 hours and 52 minutes was in EVA. == Post-NASA activities ==