Questions tagged [apollo-11]

Apollo 11 landed the first humans, Neil Armstrong and Buzz Aldrin, on the surface of the Moon on July 20, 1969.

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What is the scientific reason for selecting July 20 1969 for the moon landing?

There might be no reason but I doubt the date had simply no reason. I believe there may have been personal significance to Neil Armstrong. Alternatively picking a summer date may have been safer.
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The speed of Apollo 11 at first stage separation was apparently only about 40% of what NASA claims? What does this indicate?

The second stage of Apollo 11 generated a greater than 20 deg shock-wave half angle which corresponds to less than $1000 \frac{m}{s}$ forward speed not 6000 mph ($2682.24 \frac{m}{s}$)? I measured ...
32
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1answer
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How did the Apollo 11's Eagle ascent stage find the CSM after leaving the Moon?

I've always been curious how did the Apollo 11's Eagle ascent stage of the Apollo Lunar Module navigate back to the Apollo Command/Service Module (CSM) that was in lunar orbit? Was it simply a case ...
6
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1answer
995 views

Why was Buzz Aldrin not Awarded the Congressional Space Medal of Honor? [closed]

According to the award's requirements, the Congressional Space Medal of Honor may be awarded to "any astronaut who, in the performance of his duties, has distinguished himself by exceptionally ...
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2answers
158 views

Where is the Neil Armstrong interview I heard on Fresh Air with Terry Gross?

A couple of years ago I heard Neil Armstrong interviewed by Terry Gross on NPR's Fresh Air. He was talking about manually piloting the Apollo 11 lunar module in extremely stressful conditions. Terry ...
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1answer
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What is the procedure to stop the descent engine on the Apollo 11 LEM?

What is the correct procedure to stop the descent engine on the Apollo 11 LEM? When the LEM has a contact light on Apollo 11, there is some terminology spoken that I'm assuming is important (and ...
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2answers
6k views

Success-fail probabilities for Apollo XI?

Is it known whether probabilities of success vs failure (and specifically fatal failures) were estimated at the time for the Apollo XI mission? Or perhaps some current estimates?
36
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1answer
26k views

Why does the ascent stage of Apollo 11's lunar module look like it's made of paper?

Here's an image (AS11-40-5922) from Apollo 11 that NASA describes as: View of the ascent stage from the northeast. Note the wrinkled surface of the RCS plume deflector and the warping of the rear ...