For Neil Armstrong, the First Moon Walker, It Was All about Landing the Eagle

Boulders, a crater, moon dust and an overworked computer all stood in the way of humankind's first lunar touchdown















Share on Tumblr

Editor's note (8/25/12): Neil Armstrong's family confirmed his death today at age 82. Earlier this month, shortly after his birthday, he had had corronary bypasss surgery.

"In my view, the emotional moment was the landing. That was human contact with the moon, the landing…. It was at the time when we landed that we were there, we were in the lunar environment, the lunar gravity. That, in my view, was…the emotional high. And the business of getting down the ladder to me was much less significant."

Neil Armstrong's words to me, in a 1988 interview, came as a real surprise. Like most people, I think, I had expected that for Armstrong, the moment when he took humanity's first step onto another world would have been the ultimate high point of his Apollo 11 mission. As one of the 600 million people who witnessed history's first moon walk on live TV and radio, I remembered my own sense of awe seeing Armstrong's "one giant leap for mankind." And so, when I interviewed him as part of my research for my 1994 book, A Man on the Moon: The Voyages of the Apollo Astronauts, one of the questions I most wanted to ask was how he felt, taking that incredible step. What I hadn't fully realized was that for a test pilot like Armstrong, compared with landing on the moon, setting foot on it was no big deal.

Of all the challenges Armstrong and his crew faced on Apollo 11, the landing itself was far and away the most difficult. Even if there were no malfunctions or other technical problems—an unlikely scenario—the descent would test the abilities of the entire Apollo team, Mission Control, as much as the astronauts themselves. In just 12 minutes, Armstrong and co-pilot Buzz Aldrin had to bring their lunar module Eagle from a height of 50,000 feet, orbiting at a speed of several thousand miles per hour, down to the surface in what amounted to a controlled fall. With no atmosphere, neither wings nor parachutes would have been useful; the only means of controlling the descent was by varying the thrust of Eagle's descent rocket. Adjusting the lander's flight path was especially tricky; with the craft balanced on rocket thrust, changing direction required tilting the entire spacecraft slightly to one side. And as Armstrong and Aldrin were all too aware, there was only enough fuel for one landing attempt. No wonder that before he and his crewmates left for the moon, Armstrong privately concluded that they had a 90 percent chance of returning safely to Earth but only a 50–50 chance of pulling off a successful landing.

And they almost didn't pull it off. The problems began soon after Armstrong and Aldrin began their descent on July 20, 1969. First it was trouble with communications with Earth. Then, alarm tones in the astronauts' headphones signaled something even more serious: the onboard computer, which was controlling the craft's speed and orientation, was becoming overloaded with tasks. Fortunately, experts in Mission Control soon found a way to work around the problem. But the alarms had diverted Armstrong's attention just at the time when he had planned to be watching for landmarks he'd memorized along Eagle's descent path, and scouting for a good landing spot. By the time the computer trouble quieted down and Armstrong was able to look out the window again, he discovered he had a new problem: Under the control of the computer, the lander was heading directly for a football stadium–size crater. The surrounding area was strewn with boulders, some of which were as big as cars.

For a moment—and only a moment—Armstrong was tempted by the idea of trying to set down just shy of those boulders, which he knew would be of great interest to scientists on Earth. But they were going too fast; there were just too many rocks. Armstrong took over from the computer, steering Eagle over the giant crater and the boulder field, and flew onward, hunting for safer ground. While Aldrin read off data on the craft's diminishing speed and altitude, Armstrong scanned the ground ahead. Everyone, in space and on Earth, was very aware that with each passing moment his fuel supply was dwindling.

Finally, Armstrong had found a relatively smooth spot, and with just 100 feet  to go he brought Eagle into a final, vertical descent. Armstrong knew it was crucial to land without any sideways motion, lest they risk tipping over at touchdown. But now came one more problem: The blast of the descent rocket was kicking up moon dust, sending it rushing outward in all directions and wrapping the landscape in a fast-moving haze. Armstrong fixed his gaze on rocks sticking up through the blowing dust; using them as reference points, he guided Eagle slowly downward, about as fast as an elevator. Words of warning came from Earth: just 60 seconds of fuel left before he would have to abort the landing.

In the back of his mind, Armstrong knew that once they got below 20 feet or so, even if the engine ran out of fuel, in the weaker lunar gravity they would just fall the rest of the way onto the surface and be okay. Now another call from Earth: 30 seconds of fuel left before a mandatory abort. And then, from Aldrin: "contact light." A blue light on the instrument panel signaled that one of three spindly probes at the end of Eagle's landing legs had touched the surface. The craft settled onto the Sea of Tranquility so gently that neither man felt the impact. Armstrong shut down the engine—with about 20 seconds' worth of fuel remaining. Then all was still. Seven hours later he would emerge from Eagle, climb down its ladder, and take the momentous step the world was so excited about.

But for Armstrong himself, the moment of triumph had already come. He keyed his mike and announced, "Houston, Tranquility Base here. The Eagle has landed."



ABOUT THE AUTHOR(S)

Science journalist and space historian Andrew Chaikin is author of A Man on the Moon. His latest book, co-authored with Victoria Kohl, is Voices from the Moon: Apollo Astronauts Describe Their Lunar Experiences.


19 Comments

Add Comment
View
  1. 1. nfiertel 03:43 PM 7/17/09

    I know that TWO men landed on the moon and the fact that only one could walk out to the surface at a time is totally irrelevant. I wonder why people do not consider the incredible bravery of the three who went to the moon and the two who actually landed and then strode upon this new world. It is a great injustice in my estimation that it is only Buzz who is remembered. I give him great credit as the pilot of this craft but bravery..There were three who saw and then there were two who were the first humans on the moon and we ought to remember that in our world's history.

    Reply | Report Abuse | Link to this
  2. 2. CB_Brooklyn 07:09 PM 7/18/09

    The Living Moon

    http://www.thelivingmoon.com/43ancients/02files/Moon_Images.html

    Reply | Report Abuse | Link to this
  3. 3. backinfront 06:27 PM 7/19/09

    Man landed on the moon. Literally. Armstrong's mind was one with the Moon and perhaps he was the Moon at that treacherous moment with a possibility of crash landing and/or running out of fuel. Incredible story.

    Reply | Report Abuse | Link to this
  4. 4. timmy2shooz in reply to nfiertel 04:14 PM 7/21/09

    eh?

    Reply | Report Abuse | Link to this
  5. 5. zorkamh in reply to nfiertel 03:10 PM 8/16/09

    It was not Buzz who was the first man to walk on the moon ,it was Armstrong and he is the one that should and is remebered, as it should be. It is always the first one to be remebered. What about Columbus, he did not come to America alone but who remembers any of the sailors that came with him? Any way Buzz is all over the place so people seem to know him .I think Neil Armstrong is the real hero here.

    Reply | Report Abuse | Link to this
  6. 6. hawkeye 12:46 AM 8/17/09

    They're all "real" heroes. Neil Armstrong was indeed first to walk on the moon, and will always get proper credit for that in the history books. But as he himself would probably be the first to insist, it was teamwork that got him there, in position to land and walk on the moon. There were tens of thousands of people involved in one of the greatest efforts in our history.

    But this is a bittersweet anniversary. I can't help but remember what happened next. Instead of building upon that accomplishment, establishing a base and building infrastructure to push onward to Mars, the bean counters and mental midgets running the goverment shut the program down and started a series of cuts to NASA funding, abandoning the technological capability that had been so laboriously built, at such great expense.

    So now, 40 years later, not only are we not on Mars, we are told we cannot even regain the ability to send a mission back to the moon before 2028. And the chinese are planning a base on the moon to mine helium-3, to supply their energy needs for the next hundred years or so.

    And you know what? If the americans have lost the backbone and the will to explore the ultimate frontier for the human race, I guess we should be thankful that the chinese are there to pick up the standard for mankind, and "soar with the eagles", while we "roost with the turkeys". DeMaistre was right - people DO generally get the government they deserve.

    Reply | Report Abuse | Link to this
  7. 7. lcchen008 09:50 AM 8/21/09

    people DO generally get the government they deserve, totally right!

    Reply | Report Abuse | Link to this
  8. 8. Chessiecat in reply to nfiertel 08:21 PM 9/13/09

    You are right; there were 2 men who landed on the moon; three men in the mission. But Buzz Aldrin was not the pilot of Apollo 11, it was Neil Armstrong. Buzz Aldrin was the co-pilot. And if it is so irrelevant who walked on the moon, then why does Buzz Aldrin complain all the time that he should have been the 1st to descend to the lunar surface and walk on the moon-not the 2nd. He is a bitter person with a huge ego that instead of being angry and bitter about having to take orders from a civilian, although Armstrong was an aviator in the Navy at one time, should be thankful that he was chosen to walk on the lunar surface and see a beautiful and different view. I think Mike Collins should have been the one to follow Neil Armstrong down the ladder and Buzz Aldrin left in the craft orbiting the moon. Collins would have appreciated more.

    Reply | Report Abuse | Link to this
  9. 9. elderlybloke 05:29 PM 8/25/12

    Americans are obsessed about who climbed out the door first.
    What is so bloody important about that?

    The success of that and the following six missions(yes including Applo 13) was dependant on team work,and not one of the team being more important than the others.

    Regarding No.8- You are spouting crap out of a hole in your bum.

    Reply | Report Abuse | Link to this
  10. 10. rob23da 07:23 PM 8/25/12

    Hawkeye hit it on the head- cancelling Apollo was a huge mistake. Given where NASA is now, thanks to politics, it makes what Armstrong Aldrin and Collins did in 1969 all the more remarkable.

    Reply | Report Abuse | Link to this
  11. 11. geojellyroll 08:07 PM 8/25/12

    As kids in the 60's in Europe we could name all the cosmonauts and astronauts. We all wanted to become space explorers.

    Then what happened? Hats off to Armstrong for getting the job done but he was the wrong choice. Glenn or Aldrin would have been front and center inspiring another generation...instead Armstrong was a great astronaut but an almost non-existent public figure.

    Today...98% of the world's population couldn't name the first man to walk on the moon. In contrast back in the 60's we thought he'd be one of the most famous people in history.

    Reply | Report Abuse | Link to this
  12. 12. Bob_CA 10:21 PM 8/25/12

    As someone who has been a pilot, the idea that anything but the moment of touchdown would be the highlight for the guy with the flight controls is silly. For Armstrong, that was the hard work, especially with only that wimpy "computer" to help. Once he was on the moon with then engine shut down, the hard work was done. From then on all he had to do was be careful not to trip.

    Reply | Report Abuse | Link to this
  13. 13. Kafpauzo 12:26 AM 8/26/12

    It is truly sad that this giant leap for mankind was essentially thrown aside.

    Apparently the people who made the fateful decisions could not fathom the magnitude of these momentous events. The dawn of the true space age, the colonization beyond Earth, was abandoned and postponed for a very long time.

    In this regard it is most fortunate, for the sake of all mankind, that there's a project to finance the creation of a colony on Mars by turning it into a reality show on TV:

    http://mars-one.com

    Reply | Report Abuse | Link to this
  14. 14. CeeBee in reply to Chessiecat 08:14 AM 8/26/12

    I've never heard Buzz say anything like that. On the contrary, every interview I've heard of him, he talks about how Armstrong was a brilliant pilot and deserving of the command of the mission and that he has never felt jealous of him since he knew he deserved it.

    They are two different men with different personalities. Armstrong was quiet and reserved. Aldrin is exuberant and likes the spotlight. They are both amazing men who took incredible risks at a great time in our history.

    Reply | Report Abuse | Link to this
  15. 15. alan6302 09:53 AM 8/26/12

    Too bad he did not use herbal and chose the knife.

    Reply | Report Abuse | Link to this
  16. 16. Bob_CA in reply to geojellyroll 02:01 PM 8/26/12

    Society WAS bored with science, and they were from the beginning. If Kennedy had pitched the Apollo program for science reasons it would've taken 30 years if it happened at all. This was a race, a race with our Cold War adversaries the USSR, and it was a race that we were losing badly when JFK asked for the commitment to a lunar landing. The nationalism you decry (which I also consider to be overblown) was the ONLY reason that funding was made available. As for advances in technology shifting to garages and basements, that's SERIOUSLY overblown. Sure, there are a few big companies that were started a few years later that have become huge (and I actually used Microsoft [MITS] Basic on an Altair 8800), but let's not forget that there was a lot going on with NASA in those days, e.g. the Viking Mars missions, the Landsat series, the Pioneer and Voyager missions to the outer planets, and the very expensive and complex processes of designing and building the space shuttle and the Hubble telescope. There's also the slightly important GPS system that was developed in those years. Besides, regarding the "digital world", if you think back to the digital logic available in those days, and how integrated circuits changed from the early days, most of that happened in big companies, government labs, and university labs funded by government. Claiming that the Feds pulled back to sit on their hands while everything moved to garage shops is nonsense. The US did turn away from the moon, mostly because the Apollo program was really not based on science, although it certainly produced a lot of good science. It was a race and we won it, so why keep running (at huge cost)? The real science missions continued and even today, decades later, we are exploring the boundaries of the solar system with one of those spacecraft, Voyager I. I seriously doubt there are any Altair 8800s or Apple Is still producing cutting-edge science.

    Reply | Report Abuse | Link to this
  17. 17. Ngoldart 10:28 PM 8/28/12

    Both Armstrong and Buzz are heros and they should be remembered as such but there are also so many other heroes in the space race that go unknown and unnoticed. Let's not forget them.

    http://nathanielgold.blogspot.com/2012/08/chimp-sketch-of-week-28.html

    @NGoldArt

    Reply | Report Abuse | Link to this
  18. 18. wildman987 01:39 AM 12/17/12

    The reason that Armstrong, a civilian at the time, was chosen as the man to pilot the Eagle was that Armstrong was a superb pilot. His experience as a Naval Aviator (78 m issions over Korea) and as a test pilot, gave him the needed skills to handle the lunar landing. The most important skill, which ended up being needed, was the ability to think your way out of trouble.

    Reply | Report Abuse | Link to this
  19. 19. wildman987 01:40 AM 12/17/12

    The reason that Armstrong, a civilian at the time, was chosen as the man to pilot the Eagle was that Armstrong was a superb pilot. His experience as a Naval Aviator (78 m issions over Korea) and as a test pilot, gave him the needed skills to handle the lunar landing. The most important skill, which ended up being needed, was the ability to think your way out of trouble.

    Reply | Report Abuse | Link to this
Leave this field empty

Add a Comment

You must sign in or register as a ScientificAmerican.com member to submit a comment.
Click one of the buttons below to register using an existing Social Account.

More from Scientific American

See what we're tweeting about

Scientific American Editors

More »

Free Newsletters


Get the best from Scientific American in your inbox

Solve Innovation Challenges

Powered By: Innocentive

  SA Digital
  SA Digital

Email this Article

For Neil Armstrong, the First Moon Walker, It Was All about Landing the Eagle

X
Scientific American Magazine

Subscribe Today

Save 66% off the cover price and get a free gift!

Learn More >>

X

Please Log In

Forgot: Password

X

Account Linking

Welcome, . Do you have an existing ScientificAmerican.com account?

Yes, please link my existing account with for quick, secure access.



Forgot Password?

No, I would like to create a new account with my profile information.

Create Account
X

Report Abuse

Are you sure?

X

Institutional Access

It has been identified that the institution you are trying to access this article from has institutional site license access to Scientific American on nature.com. To access this article in its entirety through site license access, click below.

Site license access
X

Error

X

Share this Article

X