Questions tagged [eva]

Questions regarding extra-vehicular activity, or EVA, during space exploration.

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15
votes
1answer
2k views

Are there any plans for handling people floating away during an EVA?

An EVA carries the risk that objects and people may become detached from the ship/structure and drift away from it. In the case of objects they might become a hazard or their loss might be a problem, ...
13
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2answers
2k views

How did Apollo 15's depressurization work?

Artwork depicting the EVA in question, NASA, via wikimedia.org On the way back an EVA was performed, and since there wasn't an airlock, the Command Module was depressurized. Was this feature only ...
19
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1answer
3k views

How was the cosmonaut of the Soviet moon mission supposed to get back in the return vehicle?

In the Soviet Moon mission, for which the ill fated N-1 launcher was built, we know that the cosmonaut responsible for landing on the moon was to transfer from the equivalent of the command module to ...
9
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3answers
2k views

What is this spacecraft tethered to another spacecraft in LEO (vintage)

In the really nice video Brian Eno on Apollo at 03:40 there is (possibly Apollo-era but not necessarily Apollo) footage of a spacecraft tethered to another ...
4
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1answer
64 views

Was any hole in the upper layers of the Apollo suits found caused by a micrometeorite impact?

What about the micrometeorite protection layers of the Apollo suits used for lunar EVA? Was any hole found after landing on Earth?
1
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1answer
64 views

Non-biological end effectors (hands) in spacesuit design

Designing the 'end effectors' or gloves of a spacesuit is notoriously difficult. Hands have are extremely flexible and are the primary interface that humans use to interact physically with the world. ...
4
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1answer
183 views

Is this still a problem with the spacewalk granola bar?

During the Shuttle era, EVA suits had a holder for a granola bar, which gave astronauts something to snack on during long spacewalks. The food bar of compressed fruit, grain, and nuts is wrapped in ...
3
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2answers
167 views

Were there any spacecraft not configured for a spacewalk?

Since the first spacewalks were preformed, have there been any spacecraft that didn't allow for a spacewalk?
11
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2answers
2k views

Apollo command module space walk?

Could the Apollo astronauts have done an eva, from the Command Module, during the flight to or from the Moon?
6
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0answers
146 views

How many female astronauts have worn the large space suit on a space walk?

The recent all-female spacewalk was canceled because Anne McCain felt the medium sized suit was the correct choice for her for safety reasons, and there weren't enough medium sized suits. Of course, ...
5
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0answers
68 views

How frequenty have space walkers been changed based on space suit configuration?

On Friday, March 29, two astronauts were supposed to conduct what would have become the first all female space walk, Christina Koch and Anne McClain. After her first space walk on March 22, Anne ...
2
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1answer
125 views

Have astronauts lost fingernails on spacewalks before?

Spacewalks can be notoriously taxing on the body - a multi-hour spacewalk is often compared to a marathon in how much the astronaut must exert to overcome the stiffness of the suit. I remember ...
2
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1answer
191 views

Could a pressure suit be used for a short emergency EVA?

What if a docking accident leaves the spacecraft depressurized and unable to re-pressurize. The hatch may be jammed/ punctured or a window blown. In such a scenario, the astronauts would have their ...
6
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1answer
221 views

Did every shuttle flight after STS-5 carry EMUs onboard?

STS-5 is the first shuttle mission to carry Extravehicular Mobility Units onboard during the Space Shuttle program. Due to various issues happened during STS-5, the first extravehicular activity ...
2
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1answer
114 views

How Is The Quest Joint Airlock Operated?

I have searched and searched and cant seem to find any media whatsoever that explains or outlines exactly how the airlock is operated. What exactly is the process you go through to open it, do you ...
3
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0answers
104 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 ...
7
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1answer
296 views

Rescue of untethered astronaut or cosmonaut at ISS

If an astronaut or cosmonaut at the ISS becomes separated and floats away accidentally during an EVA, is there a way to rescue him or her?
4
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1answer
133 views

Were shuttle and ISS spacewalks always done with two astronauts?

Even if only one astronaut is needed for an EVA, it makes sense to have a second suited up and outside in case of an emergency. Was there ever any exception to this number (e.g. 1 or 3) for the space ...
3
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1answer
148 views

Current and near-future space suit odor reduction technology

Fox News' Bill Nye says Mars colonies won't happen: 'Are you guys high?' gives some highlights of science educator Bill Nye (The Science Guy)'s thoughts on Mars, moving there, living in artificial ...
1
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0answers
67 views

Can astronauts on an EVA communicate directly with ground stations?

Can astronauts/cosmonauts performing spacewalks at the International Space Station communicate directly with radio stations on the ground (even if only as a back-up)? Or do they need to relay their ...
2
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0answers
131 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 ...
1
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0answers
53 views

Did the Apollo astronauts do any EVAs in mid-flight? [duplicate]

For example on their way to the Moon, did the astronauts also leave the Apollo CSM during their flight? Or did they go outside only on the Moon? Were or could there have been any EVAs in mid-flight of ...
83
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3answers
19k views

Could an Apollo astronaut stand up if they fell on the moon?

I was watching old Apollo footage and noted how astronauts on the moon had a very particular gait most likely due to the poor flexibility of the EVA suits, low gravity, and need for safety. I was ...
8
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1answer
329 views

Zero gravity spacewalk above low Earth orbit?

There have been a lot of spacewalks in LEO and there have been moonwalks too. Voskhod, Gemini, Soyuz, Apollo, Skylab, Mir, Space Shuttle and ISS. But what about EVAs above LEO and below the orbit of ...
2
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0answers
247 views

Were there ever any accidents involving cold-welding on EVA?

I recall there were cases of mechanisms of spacecraft that failed due to cold-welding, but are there any records of accidental cold-welding on EVA? of e.g. an ill-prepared tool cold-welding to a part ...
4
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1answer
134 views

High velocity particle impact on humans in outer space

The Earth is constantly bombarded by matter from space. Is there any risk of high velocity dust particle/micro-object (cosmic garbage e.g.) impact on astronauts while in outer space? What chance is ...
0
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1answer
219 views

What is the purpose of this cable connecting Astronaut's boot restraint to a robotic arm?

The caption for the image ISS016-E-008937 says ISS016-E-008937 (3 Nov. 2007) --- While anchored to a foot restraint on the end of the Orbiter Boom Sensor System (OBSS), astronaut Scott Parazynski, ...
13
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2answers
301 views

Can modern EVA spacesuit be put on/taken off by single person, without assistance?

Watching TV streams of NASA spacewalks I note that at least one extra crew member helps two spacewalkers before their excursion and after it. Can modern EVA spacesuit be put on/taken off by single ...
3
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1answer
310 views

Have astronauts gotten sick on EVA?

In lots of science fiction, people have EVA suits which automatically preform First Aid or administer temporary medical help (such as painkiller injections) so that they can get themselves to a safe, ...
5
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3answers
428 views

How bright is starlight in deep space?

Say I'm way out in deep space and on EVA. If I turn off all sources of illumination, can I basically still see, or am I severely impaired by darkness? Of course I can still see the stars, but will ...
4
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2answers
489 views

Was this large pieces of “space junk” just released from the ISS in the “nadir and retrograde” direction?

According to Space.com's 02-Feb-2018 article Cosmonauts Break Russian Spacewalk Record During Space Station Antenna Repair: The cosmonauts spent the day replacing an electronics box for a high-gain ...
5
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2answers
270 views

What first aid options do astronauts have during an EVA?

If an astronaut gets unconscious or ill I suppose the colleague will help her to the airlock. But are there any other measures that could be taken already outdoors? Do they have duct tape to seal a ...
0
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0answers
71 views

What is this NASA Spaceflight article trying to explain?

The NASA Spaceflight article Extended Russian EVA complete – conducts satellite deployments contains a very long discussion about the timing of the CRS-12 launch. Had it missed the "single shot launch ...
8
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1answer
1k views

Apollo Suit sublimation coolers

Should there be a visible steam plume from the Apollo astronauts sublimation cooler in the lunar EVA videos?
15
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1answer
2k views

Why is this astronaut placing a radar reflector?

In this video we can see an astronaut on the payload bay of the Space Shuttle, placing what looks like a radar reflector, during an EVA. The following image is a frame from the video in question: ...
3
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3answers
1k views

What dangers are astronauts exposed to when facing the sun?

In this live stream, we have an astronaut facing the sun (we've seen his hands actually): I thought people doing an EVA should avoid the sun at all cost, but here he's facing it. From what kind of ...
2
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0answers
145 views

Why are crew EVA cuff checklists wrapped in Kapton tape?

As seen in this image below, the cuff checklists have Kapton tape wrapped around their edges. What is the reason for this?
5
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1answer
788 views

How do astronauts deal with micrometeorites during EVA?

There's always micrometeorites in orbit, and they constantly hit the ISS. So my question is during EVA, how do astronauts protect themselves? Is their suit designed to take impact? Since there are ...
14
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1answer
642 views

Can astronauts inside ISS hear their crewmates doing EVAs?

I was just watching a video of two astronauts doing an EVA on ISS to install some things. As I saw how they moved around the outside of the ISS using handrails and other things to grab, I was ...
3
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1answer
152 views

How many people can go on a spacewalk?

According to the lists of spacewalks (1965-1999, 2000-2014), spacewalks have all consisted of only two people. The only exceptions are the very early space missions, where only one person went out, ...
7
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1answer
495 views

How did Alexey Leonov bleed off the pressure in his space suit?

On the Voskhod 2 mission, cosmonaut Alexey Leonov performed a spacewalk which ran into issues when Lenov's spacesuit had some sort of pressure buildup. From the wiki - [Leonov] was forced to bleed ...
3
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1answer
348 views

What is the fastest time for donning a space suit?

We have the question Time to prepare for EVA out of ISS that has a good and complete answer about the hours to days long process to prepare for an EVA from the ISS. My question is just about getting ...
8
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3answers
1k views

Why did moon dust not cause problems on Apollo during the return flight from the Moon?

The Apollo Command Module and the LEM were built in clean rooms free of dust on earth and yet (knowing that they didn't have air locks on either module) the astronauts came in directly from the moon ...
10
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1answer
2k views

Spatial screwdriver

I watched the Kimbrough and Whitson's EVA on 01/06. And I'm wondering why astronauts use custom screwdriver and not the usual ones (like Makita or Dewalt, for example) ? Is it because of the battery ...
2
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0answers
56 views

What do astronauts do if they feel like itching during space-walk? [duplicate]

Astronauts need to regularly go out of ISS for the purpose of maintenance and repair. What happens if they start feeling itching inside the spacesuit? Do they have to go back inside? Do they use any ...
33
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4answers
4k views

The Loose Astronaut

A common point of drama in science fiction is the loss of a tether during a spacewalk threatening to (or actually causing) send an unlucky astronaut hurtling into space. In reality, is such a thing ...
0
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0answers
38 views

Average cost of SpaceWalk [duplicate]

How much does it costs NASA for an astronaut to perform a single spacewalk? Not including salary just the cost of actually sending someone into space.
5
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1answer
222 views

Has there been any program to develop tiny pod-like vehicles with manipulator arms for extra-vehicular activities?

Remember the pressurized repair / assembly pods from 2001 A Space Odyssey and so many other space visionary works? Has there been any programs to design & build tiny vehicles like that with ...
4
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1answer
251 views

ISS Repair/Maintenance Tools

Are the tools like the driver and the bolts on the ISS magnetized to prevent losing them when doing repair/maintenance? Is there a special way to prevent it other than magnets?
3
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1answer
72 views

Work done on spacewalks

What do most of the jobs done on spacewalks consist of? Changing small pieces on the ISS? Unbolting/unplugging a piece and putting the new one in?