Questions tagged [eva]

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

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7
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1answer
187 views

Are there really “Dead End” signs on the outside of the International Space Station?

This question currently links to the NASA video Expedition 63 Inflight interview with Yahoo Finance KPRC TV - July 24, 2020 at 07:46 where a few seconds later ...
59
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1answer
11k views

Why do astronauts wear heels?

I was reading another question on the site when I noticed the EVA suit sports heels. Why do they put heels on space suits? (cropped detailed view)
6
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1answer
65 views

Specifications on ISS EVA suit cameras

The suits that astronauts use to preform EVA's on the ISS have some sort of "TV camera" with which they stream analog video back to the ISS and then back to Earth so that we can see it on ...
2
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0answers
103 views

A Parmitano ‘maneuver’

Referring to the 2013 incident when Italian astronaut Luca Parmitano suffered a leak in his EVA suit causing water to build up dangerously around his face. By the time he was approaching the airlock, ...
7
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5answers
4k 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 ...
2
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1answer
82 views

Plans for HUD in next-generation spacesuits

A HUD (Head Up Display) allows a computer to display information directly into a user's line of sight and thus allows them to interface with that computer without needing to look at a tablet or ...
6
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0answers
118 views

Do any spacesuit designs (including prototypes, conceptual, etc) use radiators rather than open-loop cooling?

Answers to: How have space suits dissipated the heat removed from astronauts? explain how USA suits currently use open-loop cooling and do not answer this question! Typically, space suits must ...
4
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1answer
146 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 ...
6
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0answers
96 views

Can an astronaut have a private communication during a spacewalk?

In this NASA page it describes an astronaut remaining in contact during an EVA. While inside these pressurized suits, it's essential that they (the astronauts) remain in constant communication ...
1
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2answers
145 views

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 ...
27
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1answer
3k views

What sounds do astronauts hear inside their helmets during an EVA?

Besides the communications over the headsets, do astronauts hear any other sounds inside their helmets? Do they hear their own breath? Are there any mechanical sounds audible? Does the circulating ...
3
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1answer
102 views

Is it possible to create an overridable inflatable airlock seal?

If the information I obtained is correct, inflatable airlocks are sealed by the air pressure and cannot be unlocked unless the pressure is lowered(correct me if I'm wrong). Additionally, airlocks ...
7
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5answers
1k views

Could moon ice be used to fuel a steam powered jetpack for EVA in space or high altitude exploration on the moon?

For long term moon operations, would it be practical to have a jetpack that used steam as a source for EVA on the moon surface and above it in orbit? I imagine a scenario where lunar ice deposits ...
4
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0answers
34 views

What are the “25 bespoke tools (that) had to be developed” to install a new coolant system for the Alpha Magnetic Spectrometer (AMS)?

The 2020 Jan/Feb issue of the CERN Courier has an astronaut on its front cover and on the next page From the Editor begins: It’s not often that CERN Courier has the opportunity to feature an ...
3
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2answers
265 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 ...
3
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0answers
52 views

If you fell into a crater on the moon in your spacesuit and no jetpack, is there a way to use low gravity to get out of the hole?

If you fell down a crater or hole on the moon, is there a way to exploit microfravity/low gravity to get to the top? Lets say your survived a fall into Aristarchus crater on the moon with a slow slide ...
4
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1answer
285 views

In layman's terms, how hot will the skin of a spacecraft become, 144 million miles from the Sun?

Ok, last week I asked how hot would a piece of metal become at a distance from Earth to Mars facing the Sun. Thank you for all the nice replies, but I do not have much math knowledge. So let me ...
3
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1answer
148 views

How badly would commodity handheld power tools, with cheap “duct tape” modifications, work in (EVA) space?

Popular articles about the handheld power tools used on EVA by astronauts usually focus substantially on how much specialized engineering goes into making these tools. And there definitely are a lot ...
16
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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 ...
11
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1answer
757 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.
5
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0answers
97 views

Can astronauts in currently planned pressure suits survive a cabin which cannot be repressurized?

Imagine the Crew Dragon (or Stariner or Orion) has just achieved orbit. Due to a manufacturing flaw or a meteor, the window suddenly blows out. All 6 of the crew manages to get their suit visor's ...
2
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0answers
175 views

SpaceX Crew Dragon depressurization for emergency EVA

As far as I know, the Crew Dragon does not have an airlock. Therefore, if astronauts inside needed to go outside for some reason, they'd need to suit up, depressurize the cabin, and then they'd be ...
5
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0answers
67 views

Are deep-space EVAs part of the Artemis plan?

During Apollos 15, 16, and 17, the first deep-space EVAs were performed to retrieve film canisters from the exterior of the vehicle while in translunar space on the way home, producing what is, ...
4
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1answer
240 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?
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 ...
6
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0answers
87 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 ...
5
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1answer
492 views

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 ...
26
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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 ...
4
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2answers
570 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 ...
3
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0answers
48 views

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 ...
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 ...
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 ...
8
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2answers
430 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 ...
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, ...
14
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2answers
3k 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 ...
6
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1answer
333 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 ...
20
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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 ...
4
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1answer
2k 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
79 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
203 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 ...
3
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1answer
201 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
178 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
156 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
69 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
147 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 ...
3
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1answer
486 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, ...
9
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1answer
466 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 ...
3
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1answer
177 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, ...
13
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2answers
422 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 ...