Questions tagged [eva]

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

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11
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5answers
7k views

What are the consequences if an astronaut's helmet gets damaged during a spacewalk?

Note: This has become a frequently asked question. Some related situations which have been regarded as duplicates of this question include these: Leaving vehicle / going outside without spacesuit or ...
4
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2answers
515 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 ...
24
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3answers
10k views

How do astronauts turn in space?

A recent question back in Physics asks whether there is a way for an astronaut to rotate when in microgravity and without touching anything else, while still conserving angular momentum. One way to ...
7
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2answers
350 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 ...
14
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2answers
2k views

What was the source of the fluid in Luca Parmitano's suit?

There has been a lot of press (example) and commentary about the near drowning in space of Italian astronaut Luca Parmitano on July 16, 2013. We have a question Would the blast clearing technique ...
10
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2answers
15k views

How much protection do space EVA suits offer against radiation for the wearer?

How much protection do space EVA suits offer against radiation? Do they shield certain kinds of radiation more than others? Any idea how many sieverts an individual is exposed to wearing a space ...
8
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1answer
345 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 ...
5
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1answer
226 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 ...
76
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4answers
11k views

How do astronauts on EVA deal with nose itching?

It must be absolutely torturous if your nose starts itching and you can't scratch it for several hours, when you're on EVA. How do astronauts deal with it? Are they undergoing a special training, or ...
21
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2answers
1k views

How are EVA's in LEO affected by being at the night side of Earth?

Orbital periods in LEO are quite short, about 92 minutes for the ISS. So every other almost 46 minutes it is in Earth's shadow. Not only is it then out of direct sunlight, I suppose that the night ...
13
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1answer
2k views

What is the cause of discoloration along the edges of the Quest Joint Airlock thermal cover?

I've noticed this discoloration / stains / burn marks along the edges of the Quest Joint Airlock thermal cover on the hatch before, but they seem even more pronounced and contrasting with the cover's ...
9
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1answer
1k views

Cost of an EVA on the ISS?

What does it cost for an astronaut to spend an hour outside the ISS, in terms of astronaut time mission preparation time ground support personnel space suit "rent" (?) Does this cost vary for a ...
11
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1answer
2k views

Could a harpoon-like gun be used by an astronaut to stop drifting away from a ship?

I saw the movie Gravity. Spoiler alert, hover with your mouse over the yellow bar below to reveal a part of the movie's plot: Why can't they have a gun kind-of thing with a string/rope? One end of ...
21
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1answer
510 views

Would the blast clearing technique used in snorkeling work in an EVA situation?

Luca Parmitano wrote about his experience with water filling his helmet during EVA on the International Space Station. It's a harrowing account and he explains part of his thought process: I force ...
8
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1answer
615 views

How smart is an EMU (…spacesuit)?

What level of circuitry is built into the US EVA spacesuit (EMU)? What is the sophistication of control algorithms used? (PID, discrete logic, $H_\infty$?) Rationale: re-reading Andy Weir's book.
83
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3answers
20k 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 ...
45
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2answers
7k views

How did the Apollo astronauts change film in their cameras?

Part of Apollo astronaut training was learning to be a pretty good photographer without a viewfinder. The Hasselblad 500EL Data Camera used magazines with 160 color/200 B&W exposures on 70mm film. ...
10
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2answers
909 views

Time to prepare for EVA out of ISS

How much time is needed to an astronaut on ISS to prepare herself for an EVA? Is this time so much different from time needed during Apollo missions?
15
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1answer
681 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 ...
7
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1answer
569 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 ...
16
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1answer
1k views

Why is the Sokol spacesuit considered inadequate for EVA?

According to the Wikipedia article on the Sokol spacesuit, The Sokol space suit (Russian: Cокол, Falcon) is a type of Russian space suit, worn by all who fly on the Soyuz spacecraft. It was ...
13
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2answers
722 views

What level of protection is required for spacewalkers?

If you're going on a space walk, you need to be shielded from cosmic rays, temperature, and possibly other issues. What components of cosmic rays are dangerous? What sort of protection is used to ...
11
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2answers
394 views

What are the requirements differences between Escape Suit and EVA Suit?

I read up articles on both types - EVA suits meant for spacewalks, and Escape Suits used in launch and reentry - but other than bright orange color for ACES making it easy to find and the fact that ...
6
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0answers
83 views

Are the Electronic Tools used in the ISS and in the NBL same or different?

Most of the time, we see astronauts carrying electronic tools like power drills during an EVA. They undergo training in the Neutral Buoyancy Lab (NBL) for the same. Are the electronic tools used in ...
6
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1answer
260 views

Orlan suit inside arm/hand access

I have heard than under some conditions a user of the Orlan EVA Suit can retract his/her arm inside the suit torso, then re-insert arm into suit sleeve and glove (under suit pressure). Can you confirm ...
1
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1answer
69 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. ...
0
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1answer
246 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, ...