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Apollo 11: the story on HearLore | HearLore
Apollo 11
Neil Armstrong was not the man the world expected to take the first step onto the Moon. While Buzz Aldrin lobbied aggressively to be the first to exit the spacecraft, citing his role as Lunar Module Pilot and his desire for the historic moment, Armstrong remained a stoic figure who deferred to protocol and command hierarchy. The decision to make Armstrong the first man on the Moon was not based on his personal ambition, which he famously lacked, but on a calculated political strategy by NASA leadership. Mission Director George Mueller and others argued that the first person to walk on the Moon should embody the calm, quiet demeanor of Charles Lindbergh, the aviator who had flown the Atlantic alone. Aldrin, a former Air Force test pilot with a brash personality, was deemed too volatile for the role, while Armstrong, a civilian test pilot with a reputation for unflappable coolness, was the ideal choice. This decision was kept secret from the crew until late spring of 1969, leaving Aldrin to believe for decades that the hatch location dictated the order of egress. The tension between the two men was palpable during training, yet Armstrong refused to swap Aldrin for Jim Lovell, believing Lovell deserved his own command, a decision that would later define the crew dynamics of Apollo 13.
The Space Race Shadow
The Apollo 11 mission did not occur in a vacuum but was forged in the fires of a desperate geopolitical struggle known as the Space Race. The Soviet Union had launched Sputnik 1 on the 4th of October 1957, a simple metal sphere that triggered a national crisis in the United States and led to the creation of NASA. When Yuri Gagarin became the first human in space on the 12th of April 1961, the United States was forced to scramble to catch up. President John F. Kennedy responded to this challenge by setting an audacious goal: to land a man on the Moon and return him safely to Earth before the decade was out. This declaration was made on the 25th of May 1961, a date that would become the starting gun for the most expensive and complex engineering project in human history. The Soviets were not idle; they were developing the N1 launcher to compete with the American Saturn V, but their program suffered repeated failures. In a final, desperate attempt to beat the Americans, the Soviet Union launched Luna 15 on the 13th of July 1969, just three days before Apollo 11 launched. Luna 15 reached lunar orbit before Apollo 11 and attempted to return lunar soil to Earth. However, a malfunction caused Luna 15 to crash in Mare Crisium about two hours before Armstrong and Aldrin lifted off from the Moon. British astronomers monitoring the Soviet probe recorded the drama, noting that the situation had reached a culmination of the highest order, a silent race that the Soviets lost by a matter of hours.
Why was Neil Armstrong chosen to be the first person on the Moon instead of Buzz Aldrin?
NASA leadership selected Neil Armstrong as the first person on the Moon because they wanted a calm and quiet figure to embody the role, unlike Buzz Aldrin who was considered too volatile. The decision was a calculated political strategy that prioritized Armstrong's unflappable coolness over Aldrin's aggressive lobbying for the historic moment.
When did the Soviet Union launch Luna 15 to compete with Apollo 11?
The Soviet Union launched Luna 15 on the 13th of July 1969, just three days before Apollo 11 launched. This probe reached lunar orbit before Apollo 11 but crashed in Mare Crisium about two hours before Armstrong and Aldrin lifted off from the Moon.
What caused the 1201 and 1202 computer alarms during the Apollo 11 lunar descent?
The 1201 and 1202 program alarms were caused by a hardware design bug in the rendezvous radar system that left the radar in the wrong position. This error caused the computer to process data from both the landing and rendezvous radars simultaneously, creating an involuntary counter that stole processing cycles from the landing software.
How much fuel remained when the Lunar Module Eagle touched down on the Moon on the 20th of July 1969?
The Lunar Module Eagle touched down with less than 30 seconds of fuel remaining, though post-mission analysis suggests the actual figure was closer to 50 seconds. The premature low fuel warning was the result of propellant sloshing more than expected, which uncovered a fuel sensor.
When did Neil Armstrong step off the ladder of the Eagle to walk on the Moon?
Neil Armstrong stepped off the ladder of the Eagle at 02:56:15 UTC on the 21st of July 1969, six and a half hours after landing. This event marked the first time a human walked on the Moon, with the broadcast received by at least 600 million people on Earth.
When did the Interagency Committee on Back Contamination lift the quarantine on the Apollo 11 astronauts?
The Interagency Committee on Back Contamination lifted the quarantine on the astronauts and Columbia on the 10th of August 1969 in Atlanta. The crew had been in Earth-based quarantine for 21 days following their return to Earth on the 24th of July 1969.
Five minutes into the lunar descent, the Lunar Module Eagle began to suffer from a series of unexpected computer alarms that threatened to abort the landing. The guidance computer, designed by MIT and led by software engineer Margaret Hamilton, began to display 1201 and 1202 program alarms, indicating executive overflows where the computer could not complete all its tasks in real-time. Inside Mission Control, computer engineer Jack Garman told Guidance Officer Steve Bales that it was safe to continue the descent, a decision that allowed the mission to proceed. The alarms were caused by a hardware design bug in the rendezvous radar system, which was left in the wrong position, causing the computer to process data from both the landing and rendezvous radars simultaneously. This created an involuntary counter that stole processing cycles from the landing software. The problem was so severe that the computer had to postpone some tasks, yet the landing software remained robust enough to handle the load. This was not a software failure but a hardware design bug previously seen during testing of the first uncrewed Lunar Module in Apollo 5. The software engineer Don Eyles later concluded that the electrical phasing mismatch between two parts of the rendezvous radar system caused the stationary antenna to appear to the computer as dithering back and forth. The extra spurious cycle stealing caused the computer alarms, but the system was designed to prioritize landing tasks over less critical ones, allowing Armstrong to continue his descent despite the chaos.
The Eagle Has Wings
At 20:17 UTC on the 20th of July 1969, the Lunar Module Eagle touched down on the Moon with less than 30 seconds of fuel remaining, a margin that was later found to be closer to 50 seconds. Armstrong had taken semi-automatic control of the spacecraft because the computer was targeting a boulder-strewn area near West crater, a hazard that could have doomed the mission. He cleared the crater and found another patch of level ground, but the lunar dust kicked up by the engine impaired his ability to determine the spacecraft's motion. The situation was so precarious that Armstrong discovered his new landing site had a crater in it, forcing him to clear the crater and find another patch of level ground. The engine shut down three seconds after the contact light indicated that one of the probes hanging from the footpads had touched the surface. Aldrin immediately said, "Okay, engine stop. ACA, out of detent," and Armstrong acknowledged the status. The landing was so close to disaster that post-mission analysis showed the real figure for fuel remaining was probably closer to 50 seconds. The astronauts encountered a premature low fuel warning, which was later found to be the result of the propellant sloshing more than expected, uncovering a fuel sensor. On subsequent missions, extra anti-slosh baffles were added to the tanks to prevent this. The landing site was named Tranquility Base, a name that Armstrong chose to emphasize to listeners that landing was complete and successful. The relief in Mission Control was palpable, with Charles Duke, the CAPCOM, responding, "Roger, Twan, Tranquility, we copy you on the ground. You got a bunch of guys about to turn blue. We're breathing again. Thanks a lot."
The First Step
At 02:56:15 UTC on the 21st of July 1969, six and a half hours after landing, Neil Armstrong stepped off the ladder of the Eagle and declared, "That's one small step for [a] man, one giant leap for mankind." The word "a" in the phrase was not audible in the transmission, leading to decades of debate about whether Armstrong actually said it. Some explanations suggest his accent caused him to slur the words "for a" together, while others point to the intermittent nature of the audio and video links to Earth, partly because of storms near Parkes Observatory. A more recent digital analysis of the tape claims to reveal the "a" may have been spoken but obscured by static. Armstrong intended to say "That's one small step for a man," but the word "a" is not audible in the transmission, and thus was not initially reported by most observers of the live broadcast. The broadcast was received at Goldstone in the United States, but with better fidelity by Honeysuckle Creek Tracking Station near Canberra in Australia. Minutes later the feed was switched to the more sensitive Parkes radio telescope in Australia. Despite some technical and weather difficulties, black and white images of the first lunar EVA were received and broadcast to at least 600 million people on Earth. Copies of this video in broadcast format were saved and are widely available, but recordings of the original slow scan source transmission from the lunar surface were likely destroyed during routine magnetic tape re-use at NASA. The surface dust was described as "very fine-grained" and "almost like a powder," and Armstrong found moving in the lunar gravity, one-sixth of Earth's, to be "even perhaps easier than the simulations."
The Solitary Orbit
While Armstrong and Aldrin explored the lunar surface, Michael Collins remained alone in the Command Module Columbia, orbiting the Moon in a solitude that he described as "awareness, anticipation, satisfaction, confidence, almost exultation." Collins never felt lonely during his day flying solo around the Moon, despite the fact that it has been said "not since Adam has any human known such solitude." He considered his third to be as necessary as either of the other two. In the 48 minutes of each orbit when he was out of radio contact with the Earth while Columbia passed round the far side of the Moon, the feeling he reported was not fear or loneliness, but rather a deep sense of purpose. Collins performed maintenance activities such as dumping excess water produced by the fuel cells and preparing the cabin for Armstrong and Aldrin to return. When Mission Control informed him there was a problem with the temperature of the coolant, Collins flicked the switch on the system from automatic to manual and back to automatic again, and carried on with normal housekeeping chores. He described his time on the back side of the Moon as "relaxing," a stark contrast to the tension on the surface. Collins was prepared for a contingency in which he would fly Columbia down to meet Eagle, but the rendezvous was successful, and the two docked at 21:35 UTC on the 21st of July 1969. The ascent stage of the LM was jettisoned into lunar orbit at 23:41, and later NASA reports mentioned that Eagle orbit had decayed, resulting in it impacting in an "uncertain location" on the lunar surface. In 2021, however, some calculations show that the lander may still be in orbit.
The Return and The Quarantine
The return to Earth was fraught with its own dangers, including a storm front that threatened to rip the parachutes to shreds. US Air Force Captain Hank Brandli had access to top-secret spy satellite images and realized that a storm front was headed for the Apollo recovery area. He alerted Navy Captain Willard S. Houston Jr., who had the required security clearance, and they advised NASA to change the recovery area, each man risking his career. A new location was selected northeast of the original site, altering the flight plan and requiring a different sequence of computer programs. The crew were also warned they would not be in a full-lift attitude when they entered the re-entry phase. On the 24th of July 1969, at 16:44 UTC, Columbia's drogue parachutes were deployed, and seven minutes later Columbia struck the water forcefully east of Wake Island, south of Johnston Atoll. The module landed upside down but was righted within ten minutes by flotation bags activated by the astronauts. The possibility of bringing back pathogens from the lunar surface was considered remote, but NASA took precautions at the recovery site. The astronauts were rubbed down with a sodium hypochlorite solution and Columbia wiped with Povidone-iodine to remove any lunar dust that might be present. The astronauts were winched on board the recovery helicopter and wore biological isolation garments until they reached isolation facilities on board Hornet. They began the Earth-based portion of their 21 days of quarantine, a practice that would continue for two more Apollo missions before the Moon was proven to be barren of life. On the 10th of August 1969, the Interagency Committee on Back Contamination met in Atlanta and lifted the quarantine on the astronauts, on those who had joined them in quarantine, and on Columbia itself.
The Global Celebration
Following their return to Earth, the Apollo 11 crew received widespread international acclaim, with an estimated six million people lining the streets of New York City and Chicago for ticker-tape parades on the 13th of August 1969. That evening, a state dinner was held in Los Angeles at the Century Plaza Hotel to commemorate the historic achievement, attended by members of Congress, 44 state governors, Chief Justice of the United States Warren E. Burger, and ambassadors from 83 nations. President Richard Nixon and Vice President Spiro Agnew awarded each astronaut the Presidential Medal of Freedom, the highest civilian honor in the United States. On the 16th of September, the astronauts addressed a joint session of Congress, where they presented two American flags to the House of Representatives and the Senate. The celebrations continued with a 38-day world goodwill tour titled "Giant Leap," which began on the 29th of September and concluded on the 5th of November 1969. The astronauts visited 22 countries and met with numerous heads of state, prime ministers, royalty, and civic leaders. Crowds in the tens or hundreds of thousands gathered to greet the astronauts in each city. Numerous countries and organizations honored the Moon landing by issuing special commemorative items, including postage stamps, coins, medals, plaques, and magazine features. The success of Apollo 11 contributed to a brief spike in interest in science and technology education, often referred to as the "Apollo effect," influencing a generation of engineers and scientists. The mission had fulfilled the national goal set in 1961 by President John F. Kennedy, and the world had never been closer together before.