Questions tagged [eva]

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

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Can we create a vacuum inside an EVA suit when the outside is pressurized, will it implode?

EVA suits are specially designed spacecrafts for astronauts during spacewalks. I can say for sure, it can handle the following cases of pressurization of the system: Pressurized inside, but vacuum ...
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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 ...
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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 ...
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Who put their spacesuit boots on the wrong feet?

Was just reading Mike Massimino's memoir Spaceman and came across this fascinating line: Another time a spacewalker - and this is a true story - accidentally put his right boot on his left foot ...
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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 ...
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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 ...
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Does reflected sunlight from the ISS prevent astronauts from seeing the stars during an EVA?

I'm assuming during an EVA when an astronaut is facing the station reflected sunlight reduces an astronaut's dark adapted vision to the point they can no longer see the stars until either the station ...
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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 ...
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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 ...
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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 ...
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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, ...
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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 ...
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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 ...
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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 ...
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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?
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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. ...
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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 ...
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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 ...
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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?
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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?
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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 ...
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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, ...
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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 ...
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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 ...
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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, ...
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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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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, ...
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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 ...
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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 ...
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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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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?
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 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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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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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 ...
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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 ...
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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: ...
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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 ...
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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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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, ...
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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 ...