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48 votes

Could a deadly fire start within a spacesuit?

Yes, because a deadly fire has started within a spacesuit. Fortunately no one was inhabiting it at the time (although a nearby person was injured) In 1980 a Shuttle EMU being tested erupted in flames ...
Organic Marble's user avatar
40 votes

Why aren't the radiators on the ISS straight?

From the horse's (Vought) mouth, the angle created between each panel and its corresponding scissor beam (20°) is to "provide structural stiffness": The deployment is achieved by rotating ...
ymb1's user avatar
  • 2,423
31 votes

Why aren't the radiators on the ISS straight?

This is a scissor mechanism, as used in lifts and pantographs. A fundamental property of the scissor mechanism geometry is that it cannot "open completely" (90* rotation of members) due to ...
Woody's user avatar
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31 votes

Why aren't the radiators on the ISS straight?

The radiators are jointed because they were launched folded up into a flat stack. This screenshot from the official NASA visualization tool DOUG shows one of the radiators partially retracted. This ...
Organic Marble's user avatar
15 votes

What keeps the pressure stable inside the ISS?

Wikipedia has a good overview of the ISS's ECLSS. This paper also includes some details. In particular, the Atmosphere Control and Supply (ACS) The ACS subsystem provides cabin atmosphere pressure ...
0xDBFB7's user avatar
  • 2,239
14 votes
Accepted

How does air circulate between modules on the ISS?

The Intermodule Ventilation (IMV) system A final component of the atmospheric control system is the Intermodular Ventilation (IMV) shown in Figure 4 for Node 2. The IMV system is basically a bunch of ...
Organic Marble's user avatar
9 votes
Accepted

Why was the Sabatier system removed from the ISS USOS?

Figure 4. Timeline of Recent OGA Events The timeline say the Sabatier was removed and returned at 11/28/2017 for TT&E. 2019 - Advanced Oxygen Generation Assembly for Exploration Missions - Kevin ...
Apaiss's user avatar
  • 300
9 votes
Accepted

Is the silica gel used in the ISS recycled?

The author of that answer was confused by a poorly written NASA PR document. The majority of the humidity control on the US part of the ISS is not done using silica gel. It is done using condensing ...
Organic Marble's user avatar
8 votes

Life support system weight estimate

NASA has developed a tool for sizing ECLSS systems called ALSSAT (Advanced Life Support Sizing Analysis Tool). There is a fairly detailed description available to read in the paper ALSSAT Development ...
Organic Marble's user avatar
7 votes
Accepted

How are oxygen and nitrogen replenished in the storage tanks on the ISS?

The original ISS design called for High Pressure Gas Tanks (HPGTs) to be delivered by the shuttle. With the cessation of shuttle flights, a system called Nitrogen Oxygen Resupply System (NORS) was ...
Organic Marble's user avatar
7 votes
Accepted

H2 and CO2 ventilated outboard of the ISS, could become ice flakes in the extreme temperatures outside the ISS?

Summary: The solidification temperatures given for CO2 or H2 in the original post are for atmospheric pressure. At the very low pressure at the altitude of the ISS, both CO2 and H2 will be gases at ...
WaterMolecule's user avatar
6 votes
Accepted

Where, physically speaking, are CO2, Hydrogen and Methane ventilated on the ISS

The Regenerative Environmental Control System and Life Support System (ECLSS) racks are currently located in Node 3. This picture from a presentation about the Robotic External Leak Locator shows the ...
Organic Marble's user avatar
5 votes
Accepted

How are the Archival Samples of water on the ISS handled?

There are many papers on NASA NTRS called "Analysis Results for Potable Water for ISS" for various expeditions and time frames. I have not looked at all of them. How often are the samples ...
Organic Marble's user avatar
4 votes

Pee processing in space

At least on the US side of the ISS, there is one processor for all, the Urine Processor Assembly. Source: https://space.stackexchange.com/a/26629/6944 (see link for acronymology)
Organic Marble's user avatar
4 votes
Accepted

How is CO₂ scrubbed from the air in a space vessel?

The US side of ISS uses a cyclic machine called the Carbon Dioxide Removal Apparatus (CDRA) to absorb CO2 from the air and then vent it to space. You can read about the cycles of the CDRA in this ...
Organic Marble's user avatar
4 votes
Accepted

What is the relationship between the power supply system and the thermal control system?

If my previous reasoning is correct, they would have to take over 100,000 J per second from the air. All the heat resulting from the use of electricity does not end up in the cabin air. A lot of the ...
Organic Marble's user avatar
2 votes
Accepted

What was the coolant that leaked out of the Soyuz?

Partial as I have insufficient time to check: TL;DR: External radiator that was punctured is said to have leaked isooctane according to this article. https://nplus1.ru/material/2022/12/19/cto-proteklo-...
blobbymcblobby's user avatar
2 votes
Accepted

What will be the pressure inside the Orion spacecraft?

Answer: Orion’s Atmosphere Revitalization System performs to specification over a wide pressure range, from 8.3 to 14.7 psi. This range is available to mission planners and allows docking with other ...
Woody's user avatar
  • 22.1k
1 vote
Accepted

Could a deadly fire start within a spacesuit?

A link to a NASA presentation in a comment from @bobflux provided some very useful information that I think answers this question. The presentation examines the correlation between the partial ...
phil1008's user avatar
  • 5,604

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