Questions tagged [apollo-program]

NASA's Apollo program was a 17-mission program that focused on landing a human on the lunar surface. The program was the third human spaceflight by NASA, after Mercury and Gemini.

45 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
20
votes
0answers
458 views

What is the current location of Link-built Apollo Mission Simulators?

There seems to be confusion about the final disposition of, and even the number of, Apollo Mission Simulators built by Link Flight Simulation Division. This question is not about any simulator built ...
9
votes
0answers
128 views

What programs did David Scott add to the Apollo computer for Apollo 15?

David Scott was the commander for Apollo 15. He was also a main point of contact between MIT, who developed the Apollo flight computer, and the astronauts who were going to use that computer. ...
9
votes
0answers
336 views

What went wrong with Apollo 15 astronaut Al Worden's seat when he was all alone, circularizing?

The X article NASA shock: Apollo 15 astronaut's Moon landing confession - 'Can't do anything to me now' says "NASA astronaut Alfred "Al" Worden dropped an astonishing Apollo 15 ...
9
votes
0answers
447 views

Why was the Apollo 6 service module painted white?

All other SM's were silver except Apollo 6. I'm wondering what the justification for this was, if any?
7
votes
0answers
113 views

Is anything being done to honor Gene Cernan today? (14 Dec. 2017)

14 December 1972 05:40:56 UTC US astronaut Gene Cernan returned to the Apollo 17 Lunar Excursion Module, becoming "the last man on the Moon" for forty-five years, so far. (as reported in my Space ...
6
votes
0answers
155 views

What modifications constituted the ‘reorificing’ of F-1 engines on later Saturn V flights?

The topic of uprating the Saturn V’s first stage engines appears to have been widely discussed, and yet there is little agreement as to how it was done. Early Rocketdyne F-1 engines quote lower ...
6
votes
0answers
376 views

Before the Apollo 1 fire, what was the plan for the missions leading up to a lunar landing?

The actual Apollo flights 2-6 were test launches of the Saturn rocket, the CM and LM (1 was retired due to the fire). What were the original plans? Did they intend to launch people on a Saturn ...
6
votes
0answers
456 views

Does the Apollo 10 “music” still occur on modern spacecraft?

In the news today, are reports of "outer-space-type music" that the Apollo 10 crew heard. From the mission transcript (page 197 of the PDF): ...
5
votes
0answers
179 views

How was the flammability of Velcro addressed after the Apollo 1 fire?

In a spacecraft review meeting held with Shea on August 19, 1966 (a week before delivery [of Apollo 1]), the crew expressed concern about the amount of flammable material (mainly nylon netting and ...
5
votes
0answers
383 views

Were the Apollo lunar ALSEP transmitter signals ever analyzed or used after the experiments were shut down?

This answer to the question Why were the “perfectly functioning” seismometers placed by Apollo 12, 14, 15 and 16 astronauts all shut off in 1977? links to a NASA News Release No: 77-47 dated September ...
4
votes
0answers
75 views

What is the official etymology of the term “service” module?

Are there any reputable sources about how the word "service" was chosen for the Apollo service module? (This is a question about how the term was chosen, not about what the term means. ...
4
votes
0answers
103 views

On which celestial bodies could you use the Apollo moon suits too?

If you wore the Apollo lunar suit on celestial bodies other than the Moon, on which bodies would you survive (until oxygen run out)? You obviously couldn't wear them on any (recognized) planet because ...
4
votes
0answers
61 views

Parachutes of Apollo and Crew Dragon capsules, what is different and what is the same?

The number of main chutes is different, Apollo three, Crew Dragon four. Both capsules used drogue and main chutes. Apollo had two drogue chutes with single stage reefing. Apollo used a two stage ...
4
votes
0answers
54 views

Source for Apollo 11 descent time series data?

I'd like to find the state of the Apollo LM at various times during the powered descent phase: its position relative to the Moon's surface and/or the final touchdown point; its attitude in space, and ...
4
votes
0answers
180 views

What is known about the trajectory of J002E3 (Saturn V IV-B stage of Apollo 12)?

This answer taught me about J002E3, an object detected in Earth orbit in 2002 that is assumed to be the Saturn V IV-B stage from Apollo 12. It's trajectory through space is fascinating: (source) ...
4
votes
0answers
70 views

Was there any approval to interrupt the Apollo program for 2 years for Skylab?

In researching an answer for another question, I came across this claim on a NASA history page: On September 2 [1970] Paine called a press conference to announce NASA's interim operating plan for ...
4
votes
0answers
98 views

Did anyone predict no return to the Moon for 50 years?

Back in the Apollo days, did anyone predict that there would be no return (of humans) to the Moon for 50 years? I remember some scepticism about the scientific, economic or military value of such ...
4
votes
0answers
116 views

Are any Apollo Launch Mission Rule Documents available for downloading?

Apollo Flight Mission Rule Documents (from JSC) are easy to find on the internet, but the Launch Mission Rule Documents (from KSC) - not so much. I found a couple paper copies for sale, but that's ...
4
votes
0answers
209 views

Why was the origin of the Apollo lunar module coordinate system “underground”?

Even stranger than the origin of the Saturn V coordinate system is that of the lunar module: The X-axis station reference measurements (inches) start at a design reference point identified as ...
4
votes
0answers
198 views

Did the Apollo astronauts hear any external sounds during a lunar EVA?

Did any sounds resonate through their boots or any part of their environmental suit? Could they hear the folding or rubbing of the material of their suits? Did anything impact their boots that might ...
4
votes
0answers
86 views

Apollo J Mission CSM- EPS Radiators

Were the EPS radiators on the J Mission CSM's upgraded or enlarged to accommodate the increased electrical load imposed by the sim bay equipment?
4
votes
0answers
108 views

To what extent was Apollo program training specific to each mission?

In comments and answer to this question, the time it takes to train for an Apollo mission is mentioned several times as a factor on the big rotation of crews. I figure that would actually play in ...
4
votes
0answers
207 views

Apollo re-entry guidance

I am referencing chapter 7 of the book "Spacecraft Navigation and Guidance" by Maxwell Noton. Can anyone tell me how to determine control gains C1 and C2 in equation 7.58 and 7.59 in respective ...
3
votes
0answers
40 views

Are there any possible proxies for dust accumulation on the retroreflectors on the moon?

New York Times' How Do You Solve a Moon Mystery? Fire a Laser at It links to the new open access paper First two-way laser ranging to a lunar orbiter: infrared observations from the Grasse station to ...
3
votes
0answers
107 views

Heart attacks & suicides in NASA Mission Control of the 60s?

On page 280 of Mike Gray's book Angle of Attack: Harrison Storms and the Race to the Moon (1992), Gene Kranz, legendary NASA flight director in Gemini & Apollo missions, is quoted as saying: It ...
3
votes
0answers
52 views

How many rising pipes for LOX at the the Saturn V launch tower?

The Saturn V used liquid oxygen for all three stages plus the Apollo Service Module. Were all these LOX tanks filled using the same rising pipe or did they use a seperate pipe for each tank? Using ...
3
votes
0answers
232 views

Revisiting moon landing sites?

Are there any current plans to return to the moon, preferably close to an existing landing site? After all, it seems like a sound scientific project given that there's talk of human colonization of ...
3
votes
0answers
186 views

Where can I find the amended/improvised checklists for Apollo 13 post-accident?

I have been trying to find this online without too much avail. For my own reference and cross checking, I wanted to know where I could find the emergency checklists and the "made up on the spot" CM ...
2
votes
0answers
66 views

What magnitude stars were seen from lunar surface?

I've seen a claim* that some of the Apollo astronauts stepped into the shadow of the LM, raised their gold visors, and looked up into the sky to see the stars. If this is true any mention of what ...
2
votes
0answers
201 views

Have any Apollo (or earlier) astronauts reported seeing Earth's aurora or related luminescent atmospheric effects?

Earth's aurora and related luminescent atmospheric effects are generally quite dim, and mostly but not always located in the general area of Earth's magnetic poles. That means to be seen easily by eye ...
2
votes
0answers
111 views

Puzzler: which Apollo 8 astronaut would have been positioned furthest sunwards 20 minutes after lunar insertion?

This Classic @DavidHammen answer to the question Who has been the closest to/furthest from the Sun? says: This bodes well for an Apollo astronaut being the person closest to the Sun, but bodes ill ...
2
votes
0answers
94 views

Was Arthur J. Schwaniger one of very few US born NASA scientists using metric units?

Free-return trajectories were studied by Arthur Schwaniger of NASA in 1963 with reference to the Earth–Moon system. Those trajectories were used for the first Apollo missions. Mr. Schwaniger, who ...
2
votes
0answers
170 views

What do these three historical IBM staff at NASA insignias designate?

The question Where are these historical IBM + Apollo related locations within NASA? What do these computers do? shows four images. Three of them show different IBM insignias on shirts of IBM staff. ...
2
votes
0answers
72 views

What athletic shoes have astronauts been given over the years for ground training (Apollo program etc..)?

I've seen mention of P.F. Flyers for the Mercury program, but I'm unsure if that's accurate.
2
votes
0answers
106 views

Why do the two Apollo 11 PSEP solar panels appear to have different backing materials?

The PSEP (Passive Seismic Experiment Package) was powered by a pair of solar panels mounted on extended arms. The one on the left (when looking towards the LEM) appears to have a matt grey backing: ...
2
votes
0answers
244 views

What did Apollo 11's SSTV signal sound like?

The TV signal from Apollo 11 had limited bandwidth, and an oddball format was used to send and convert the signal. All of the modern SSTV demos I've seen on YouTube seem to take around a minute to ...
2
votes
0answers
152 views

What was the nature of the visible part of the viscous wake trailing the Apollo CM during reentry?

This diagram suggests a helix in the wake, was it a single-helix, a multiple helix, or a superhelix? Is there any other part of the wake that would be visible?
2
votes
0answers
86 views

Apollo recovery zone(s)

For the Apollo missions that left Earth orbit, were there multiple recovery zones for each splashdown? How big was each zone?
2
votes
0answers
142 views

Had Apollo astronauts practiced getting up from a fall?

The question "Could an Apollo astronaut stand up if they fell on the moon?" describes several incidents of Apollo astronauts falling over while on the moon, and their attempts to get back up. Did the ...
2
votes
0answers
78 views

At what size of engine does pogo oscillation become significant

I am jist trying to understand the thresholds involved in pogo oscillation. I'm not sure where to start. But I will give a guess. As rocket size increases the tension exterted on rocket walls ...
2
votes
0answers
143 views

Have all the lunar landers been photographed?

I know that LRO photographed some landing sites. Did they get all of them? Are there still missing landers?
2
votes
0answers
134 views

What was the best late Nova rocket design among the request for proposals NASA received?

According to Wikipedia (https://en.wikipedia.org/wiki/Nova_%28rocket%29) the late Nova rocket was a "larger version" of the Saturn 5, meant to send manned missions to Mars. Some requests for proposals ...
2
votes
1answer
73 views

What was the furthest distance from Earth that Armstrong, Aldrin, and Collins reached in Apollo 11?

An estimate is fine. But if possible, I am looking for a reference that I can cite.
1
vote
0answers
64 views

How far from Earth were the Apollo astronauts when they left the Earth's magnetosphere?

I am assuming the Apollo missions recorded radiation levels as they travelled to the Moon. Have those records ever been released, as a way of determining when the Apollo astronauts left the ...
1
vote
0answers
291 views

Moment of inertia of apollo 11 lunar module

I'm currently modeling the lunar landing in 2D. When I set up the momentum balance: $\ddot{\theta} = \frac{dF_l}{J}$ where $d$ is the distance between the sidethruster and the center of mass. $F_l$ ...