Questions tagged [eva]

Extra-Vehicular Activity (EVA, or sometimes called "spacewalking") involves donning a space suit and leaving whatever vehicle you are in. Common reasons are repairing or maintaining said vehicle, but can include exploring the space or celestial object near your vehicle.

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Has any living thing been directly exposed to the vacuum of space

In our several decades of spaceflight have we ever exposed any living organism to space? I'm pretty sure this hasn't happened to Humans, but have we jettisoned some lab rats into space ("for science") ...
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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 ...
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Why are the ISS' Sequential Shunt Units not on the inside?

Recently Tim Peake and Tim Kopra carried out an EVA to replace a failed Sequential Shunt Unit, some form of electrical regulator for the solar panels, on the outside of the ISS. Why aren't these ...
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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 ...
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Why were these spacewalks so short?

I got lost down the wiki hole and ended up reading a page on Sergei Avdeyev when I noticed that he has 2 very short spacewalks listed: MIR EO-20 – 8 December 1995 – 0 hours, 37 minutes MIR EO-...
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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 ...
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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 ...
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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 ...
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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 ...
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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. ...
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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 ...
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How can space suit gloves be improved?

Gloves on space suits are hard to use because of their high gas pressure relative to the surrounding vacuum. It's simply strenuous to bend the fingers and astronauts are even said to lose their nails ...
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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 ...
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Can Orion (or Dragon or CST-100) be upgraded to do multiple EVA's (space walks)?

Orion is designed to support only one EVA. There's no airlock so the entire spacecraft would be evacuated of air during the space walk and then repressurized from gas flasks, with a storage enough for ...
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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.
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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 ...
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Could suitports on Orion/Dragon2/CST-100 make multiple EVA's available?

Suitports seem like a brilliant idea that saves lots of mass and complexity compared to an airlock, which traditionally is a dumb pressurizable gas wasting tube where the astronaut suits up. The first ...
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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 ...
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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 ...
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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 ...
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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 ...
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Could Orion be used for human exploration of Phobos and Deimos?

NASA's human space flight program plans to within 5 years or so have access to Orion and a launcher for it. Without a Lunar or Martian lander, the targets for Orion missions are limited. But given ...
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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 ...
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Humans surviving in space [duplicate]

To my (admittedly limited) understanding a human being in outer space wouldn't last very long, mainly due to three factors: the extreme cold the intense radiation and the vacuum of space So if my ...
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What would happen if you wore 'soft suit'(IVA suit) in the vacuum of space?

I am looking for the effects (mainly in the short term) that you would experience if you were to go on an EVA wearing an IVA suit. For example, I don't think that the IVA suits have any form of ...
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EVA on rotating spacecraft - differences from microgravity

What would an extra-vehicular activity (EVA) be like on a spacecraft which consists of modules along a (100s of meters long) rotating tether that causes simulated gravity? See for example these slides ...
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What parameters should be monitored during spacewalks?

When an astronaut goes to outer space, what can you measure? I'm thinking about the person's safety, so this is what I got so far: Oxygen level Heart beat Suit pressure Blood pressure Solar radiation ...
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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 ...
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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 ...
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Could the Orlan-MK use an umbilical if need be?

According to the Wikipedia article on the Orlan space suit, all models of the suit after and including the Orlan-DM were designed to be self-sustaining: The first Orlan suits were attached to the ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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 ...

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