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Michael Collins, Apollo 11 astronaut, has died

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141–150 of 191 posts

Re: Michael Collins, Apollo 11 astronaut, has died

#141
post #128

Earlier quoted context omitted.

links to some vids: https://www.drewexmachina.com/2017/12/17/a-history-of-deep-s...

I found one upscaled and interpolated to 24fps: https://www.youtube.com/watch?v=SI4ou1PpFH0

That's soooo cool. I love the audio "This is what it means to be a spaceman! Ok, back to work." Cowboys. Highly educated and extensively trained cowboys, but still cowboys and little kids.

Re: Michael Collins, Apollo 11 astronaut, has died

#142

Earlier quoted context omitted.

> The would not know at that point whether the CM pilot had his spacesuit helmet on or not, so they wouldn't know until they opened the hatch whether they had just killed him. There were windows on the command module to look in, and if they weren't sure if he was responsive/unresponsive, they could tap iron onto the command module to let Collins know they were there and spacewalking. It's an interesting thought proce…

Found it! https://spaceflightblunders.wordpress.com/2017/04/07/lunar-o... From the article, I was wrong about not knowing whether the CMP was alive: "Unless there was a very serious issue with the CM’s communications systems, NASA would know of the CMP’s fate immediately. Every astronaut wears biomedical sensors at all times, as part of their constant-wear garment. This telemetry is sent to the flight surgeon." More…

Apparently you can survive about 40 seconds in a vacuum. One option would be for one pilot to enter (as quickly as possible!) then put the CMP into a spacesuit, then re-admit the other astronaut. No clue if they could enter and re-pressurize the capsule within 30 seconds- sounds like a long-shot.

https://www.newscientist.com/article/mg20627561-700-maxed-ou...

Re: Michael Collins, Apollo 11 astronaut, has died

#143

Earlier quoted context omitted.

Found it! https://spaceflightblunders.wordpress.com/2017/04/07/lunar-o... From the article, I was wrong about not knowing whether the CMP was alive: "Unless there was a very serious issue with the CM’s communications systems, NASA would know of the CMP’s fate immediately. Every astronaut wears biomedical sensors at all times, as part of their constant-wear garment. This telemetry is sent to the flight surgeon." More…

You can survive vaccuum for a brief period of time.

> Flight recorder data from the single cosmonaut outfitted with biomedical sensors showed cardiac arrest occurred within 40 seconds of pressure loss. […] The autopsies took place at Burdenko Military Hospital and found that the cause of death proper for the cosmonauts was hemorrhaging of the blood vessels in the brain, with lesser amounts of bleeding under their skin, in the inner ear, and in the nasal cavity, all of which occurred as exposure to a vacuum environment caused the oxygen and nitrogen in their bloodstreams to bubble and rupture vessels. Their blood was also found to contain heavy concentrations of lactic acid, a sign of extreme physiologic stress. Although they could have remained conscious for almost 40 seconds after decompression began, less than 20 seconds would have passed before the effects of oxygen starvation made it impossible for them to function.

https://en.wikipedia.org/wiki/Soyuz_11

Re: Michael Collins, Apollo 11 astronaut, has died

#145
post #29

Collins' role in Apollo 11 is often minimized in the public conciseness, but I find it particularly fascinating from a human perspective. In certain ways it seems even scarier than Armstrong's and Aldrin's jobs. They at least had more direct control over their success in landing on the moon. Collins was largely powerless to help if something went wrong. If that did happen, he would have been faced with the choice of…

Conciseness?

Re: Michael Collins, Apollo 11 astronaut, has died

#146

Earlier quoted context omitted.

I'm too lazy to do the math, but what's the point-to-point distance (through the planet) of points that are 5000km along the surface?

Assuming a spherical earth, it's 4873 km.

Assuming a spherical earth in a vacuum... One of the few times that simplifying assumption matches reality.

Re: Michael Collins, Apollo 11 astronaut, has died

#147

Earlier quoted context omitted.

> The would not know at that point whether the CM pilot had his spacesuit helmet on or not, so they wouldn't know until they opened the hatch whether they had just killed him. There were windows on the command module to look in, and if they weren't sure if he was responsive/unresponsive, they could tap iron onto the command module to let Collins know they were there and spacewalking. It's an interesting thought proce…

Found it! https://spaceflightblunders.wordpress.com/2017/04/07/lunar-o... From the article, I was wrong about not knowing whether the CMP was alive: "Unless there was a very serious issue with the CM’s communications systems, NASA would know of the CMP’s fate immediately. Every astronaut wears biomedical sensors at all times, as part of their constant-wear garment. This telemetry is sent to the flight surgeon." More…

If he was incapacitated slowly, he might have time to don a spacesuit, anticipating this scenario? NASA must know.

I've been in a number of situations myself where swift incapacitation would have killed me. This is common.

Re: Michael Collins, Apollo 11 astronaut, has died

#149

Earlier quoted context omitted.

Last years Chang'e 5 mission was essentially a robotic Apollo mission. This decade does look to be promising for Lunar exploration.

Chang'e 5 was more like a modern day Luna 16 than an Apollo mission.

Luna 16 had no rendezvous in lunar orbit, while Change'e 5 had the sample return capsule rendezvous with the Orbiter, like the Appolo missions.

Re: Michael Collins, Apollo 11 astronaut, has died

#150
post #89
post #82

Earlier quoted context omitted.

> There was no was way for him to return to solid Earth unless the lunar module came back. Where did you get that idea from? This is the first time I see someone claiming something like that.

Probably from the film Apollo 13 , which depicts (likely wise) hesitance to fire the SPS due to suspected damage and instead firing midcourse correction burns with the LEM descent stage while attached to the CSM. By contrast, during the otherwise normal Apollo 11, SPS was responsible for returning Collins and the CSM to Earth (TEI) whether he retrieved Armstrong and Aldrin or not. The latter case was a rehearsed abor…

> instead firing midcourse correction burns with the LEM descent stage while attached to the CSM.

The descent stage was left on the moon so that would have been the LM ascent stage. They had 2 separate motors for descent and ascent.

But indeed Apollo 13 was very different. I think on normal missions they only brought the LM back along for TEI so as not to litter the surface with crashed LMs.

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