Questions tagged [eva]

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

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83
votes
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 ...
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 ...
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. ...
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 ...
24
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3answers
4k views

How do EVA suits manage water excretion?

This answer immediately sparked the question in my mind of how space suits manage water excretion from the person wearing them. I am aware that the astronauts had to wear diapers since one may need to ...
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 ...
24
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1answer
3k views

What are the Advantages of having a Double-pane Space Helmet?

In the following image of Exploration Extravehicular Mobility Unit (xEMU) or Artemis Generation Space Suit, it can be seen the helmet contains double-pane of glass (inside the black rectangle) What ...
22
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2answers
4k views

How long does it take to get from a spacewalk to being inside the ISS and out of your suit in an emergency?

I just saw a show that featured an incident in which an astronaut on a spacewalk to install the Canada 2 arm on the ISS was temporarily blinded by contaminated water inside his helmet. His colleague ...
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 ...
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 ...
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 ...
18
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2answers
3k views

Is it possible for a human to walk on an asteroid?

"We’ll start by sending astronauts to an asteroid for the first time in history" (President Barack Obama on Space Exploration in the 21st Century".) With a very low gravity, an asteroid is not ...
17
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5answers
1k views

Why won't JWST deploy in LEO where it is potentially serviceable?

The James Webb Space Telescope will deploy (unfold mechanically) while on the way to L2. Couldn't it do so in LEO, where it is potentially serviceable? Starliner CST-100 and Dragon are planned to soon ...
16
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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, ...
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 ...
15
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1answer
2k views

Are the EVA suits used in the ISS and in the NBL same or different?

Are the space suits used in the International Space Station (ISS) and in the Neutral Buoyancy Lab (NBL) same or different? They look similar, but they are used in two different media - one in a vacuum ...
15
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1answer
3k 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: ...
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 ...
14
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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 ...
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 ...
14
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1answer
1k views

Why did NASA discontinue use of the MMU?

One of the comments on this recent question touched on the use of the Manned Maneuvering Unit. It seemed like a good idea at the time: a system that would allow astronauts to do EVA without being ...
13
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3answers
3k views

Why couldn't Luca Parmitano just drink that water?

Of course, I am asking about the EVA incident where the Luca's spacesuit malfunctioned and his helmet filled up with water nearly drowning him. I'm really sorry, I am not assuming the mission centre ...
13
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2answers
379 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 ...
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 ...
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 ...
12
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1answer
468 views

Could future astronauts eat during EVAs?

One of the challenges that faced the Apollo moon landing crews, and particularly the longer-stay missions of the later flights, was going through a full 7 hours of extra-vehicular activity in a locked ...
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?
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 ...
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 ...
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 ...
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 ...
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 ...
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?
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 ...
9
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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?
9
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1answer
602 views

What is the biggest number of astronauts in EVA at the same time ever reached in space history?

At present days, it's common to have two astronauts/cosmonauts in EVA at the same time during ISS maintenance (or experiments or when expanding the station). But there was a time when three or more ...
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 ...
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 ...
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 ...
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.
8
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1answer
671 views

Why did NASA assess 3 separate and over 6 hours long EVAs are needed to replace a single failed Pump Module (S1 PM)?

I'm currently following US EVA-24 with Rick Mastracchio (EV1) and Mike Hopkins (EV2) tasked to replace a failed Pump Module (S1 PM), one of two external pump modules of the US section of the ...
7
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2answers
2k views

Do astronauts only perform spacewalks while the ISS is on the night side of the Earth?

Do International Space Station astronauts have to perform spacewalks only while its not facing the Sun directly? If so, I'm curious about the reason behind it. Is it only because they would be ...
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 ...
7
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1answer
312 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?
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 ...
7
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1answer
404 views

In space, how far from the nozzle is the exhaust from a space-craft capable of causing damage?

I suspect the question may be a trifle subjective; dependent upon the nature of the propulsion system, the energy levels, as also the nature of the object impinged The exhaust from a space-craft is ...
7
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0answers
138 views

Smart suits in development

This is an offshoot of this question. There's a new generation of space suits coming up (Z-series, anything that the Zvezda NPP has up its sleeves), and I wonder at the level of sophistication of ...
6
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5answers
3k views

Can a free falling astronaut change his spin and orientation?

Imagine that an astronaut during an EVA is cut loose from the space station and falls away from it in a tumbling way. Without any foreign object or air to interact with, could he stop tumbling and ...
6
votes
1answer
274 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 ...
6
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1answer
267 views

What would it be like to walk on the Asteroid 216 Kleopatra?

Here is some renditions of 216 Kleopatra. Kleopatra is a relatively large asteroid, measuring 217 × 94 × 81 km.Calculations from its radar albedo and the orbits of its moons show it to be a ...