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19 votes
0 answers
557 views

What paper size do they use on the International Space Station?

We know they have at least one printer on the ISS – that's NASA-supplied so it would be in the US Orbital Segment. Presumably there is a printer in the Russian Orbital Segment as well. (Mir had a ...
19 votes
0 answers
412 views

How did "the kid" (John Meisenheimer) calculate that there was a wave in the jet stream and Explorer 1 would be okay to launch?

The tough but timely question NASA at sIxty years, will there be a new moonshot mandate? links to the NASA YouTube video NASA 60th: How It All Began which shows a lot of really nice, historical file ...
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18 votes
1 answer
612 views

Have there ever been any incidents where something valuable was unintentionally throw out with the trash?

In "What do astronauts do with their trash on the ISS?", a commentator asked the title question and was encouraged to make it a new question, but apparently never did. The linked question is ...
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16 votes
0 answers
350 views

Has NASA ever included a ground controller or astronaut becoming insane/irrational/uncooperative in a training simulation?

NASA training simulations have included a wide variety of problems thrown at the pilots and ground controllers -- not only the typical technical failures, but also some unusual outside-world stuff ...
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15 votes
1 answer
695 views

Where would the Pascal B manhole cover be now?

As part of the Operation Plumbbob series of nuclear tests, on August 27th, 1957, at 22:35 UT (15.35 Pacific Daylight Time), at the Nevada Test Range at 32°N 116°W, a 300 ton-yield atomic device was ...
14 votes
0 answers
196 views

Does the post Apollo 13 roast mixtape still exist?

The debriefing party at the Hofbraugarten was merciless, beginning with a parody of the mission. The tape prepared by the Apollo 13 backup crew and the CapComs was not for the thin-skinned. The parody ...
14 votes
0 answers
277 views

Have astronauts ever used the helmet-to-helmet technique to talk to one another in vacuum?

Science Fiction has long written about this communication technique in vacuum: Astronauts touch their helmet against another astronaut's helmet, so that sound will transmit through that physical ...
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14 votes
0 answers
274 views

Has Buzz Aldrin’s Line-of-Sight rendezvous method ever been used?

Has Buzz Aldrin’s Line-of-Sight rendezvous method ever been used? Buzz Aldrin’s 1963 doctoral thesis describes a line-of-sight (LOS) rendezvous technique which is independent of computer and radar ...
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13 votes
0 answers
610 views

Would it be possible to receive the transmissions from JWST as an amateur?

Would it be possible to receive the transmissions from JWST (James Webb Space Telescope) as an amateur, building your own antenna? Would the transmissions be encrypted? One source cites it using: S-...
13 votes
0 answers
278 views

Does the SpaceX spacesuit address any of the criticisms of ACES raised by Columbia Crew Survival Investigation Report?

A brief history of what Shuttle crews wore for ascent and entry, from the Columbia Crew Survival Investigation Report: The shuttle was originally designed to be operated in a shirtsleeve (bare-hands) ...
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13 votes
1 answer
328 views

What space capsule is this part from?

One of my relatives has this metal component sitting in their backyard. It was a souvenir that my grandfather got to keep from his days working in the aerospace industry (primarily for Boeing). My ...
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12 votes
1 answer
402 views

How much does the ISS "banana" or flex under the constantly changing conditions of solar heating?

This answer to Do antennae on the ISS have to constantly move to maintain data links? discusses some of the challenges precisely pointing an antenna mounted to the ISS exterior. While the ISSs orbit ...
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12 votes
1 answer
295 views

Will Soyuz spacecraft be able to visit the Lunar Gateway?

I mean launch from Earth, dock to the gateway and come back.
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11 votes
0 answers
160 views

Which kinds of survival equipment does Crew Dragon have, in case of an emergency landing?

Soyuz spacecraft has various survival equipment for different cases of emergency landing. The cases include water landing, desert landing, snow winter landing (crews have special winter suits). They ...
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11 votes
0 answers
252 views

What could be strong arguments against Ingenuity following Perseverance at a safe distance when the flight test program has been a success?

This answer to the question "How long could the Mars helicopter Ingenuity keep up with the Perseverance rover if it wanted to?" reasons that indeed it could for years ! But according to the ...
  • 7,355
11 votes
0 answers
192 views

Does Crew Dragon have a quick-release hatch?

After today's Crew Dragon launch was scrubbed, it took the pad ninjas at least ten minutes to open the hatch. One of the major criticisms of the Apollo Block 1 hatch design after the Apollo 1 fire ...
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11 votes
0 answers
313 views

Were there any launch vehicles with so heavily pronounced Plume Induced Flow Separation (PIFS), other than Saturn V?

This answer describes a very interesting phenomenon of Plume Induced Flow Separation on Saturn V vehicle. (Apollo-6 S68-29737 photo, courtesy NASA) This is, basically, when "fire" from ...
10 votes
0 answers
165 views

How well would a supersonic aircraft perform in the Martian atmosphere?

I started getting curious about this question during my Flight Test Engineering class. My professor was talking about a part of the International Standard Atmosphere that is a similar pressure to that ...
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10 votes
0 answers
298 views

What's the shiny triangular feature on this Progress vehicle?

Picture from here What's the shiny, slightly curved triangular plate with rails above it? A larger version, cropped from here, thanks to a comment by ohsin.
9 votes
1 answer
319 views

What CPU does China's Zhurong rover use?

The Curiosity and Perseverance rovers, and the InSight lander, all use the BAE RAD750 processor. The Ingenuity helicopter uses a Qualcomm Snapdragon 801 processor. The only other active spacecraft on ...
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9 votes
0 answers
234 views

Has there ever been a deliberate "Find A Satellite" challenge? Actually, could there be?

Companies often offer rewards for finding security issues in their products or their own IT systems, and hackathons have a long history. I'm just wondering if there has ever been a deliberate ...
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9 votes
0 answers
190 views

Why is the water pumped out of the holding tank a minute before Falcon 9 liftoff?

SpaceX Falcon 9 - starlink mission on October 5. Video : Why is the water discharged at T- 01m:30s from the holding tank far away from the launch pad? This was also ...
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9 votes
0 answers
224 views

Detailed information about the Soyuz descent module connection box?

Anyone have some detailed information about how all this connectors, located in the soyuz descent module? Are they used only when they setup the Soyuz or they are ...
9 votes
0 answers
160 views

What rocket uses the largest percentage of Fuel/Oxidizer before liftoff?

inspired by this question: How much propellant is used up until liftoff? which asks how much propellant (fuel/oxidizer) a typical rocket uses before liftoff. What has been or is the most non-typical ...
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9 votes
0 answers
83 views

What science data has been released from Chang'e 4?

Chang'e 4 was the first soft landing on the far side of the moon. What science data has been released from it? That is, in two parts: what science was done and of that, what data has been released to ...
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9 votes
0 answers
188 views

Was the Doppler shift of InSight's "tone" measured and plotted somewhere?

I watched a YouTube live broadcast from the InSight mission control area and saw lots of images of happy people cheering and jumping up and down, which is great! If it wasn't 4 AM where I was I might ...
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9 votes
0 answers
520 views

Why was the Apollo 6 service module painted white?

All other SM's were silver except Apollo 6. I'm wondering what the justification for this was, if any?
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9 votes
0 answers
338 views

What spinoff technologies have come from the Soviet/Russian space program?

There is plenty of information available on NASA spinoff technologies including a Wikipedia page and Space SE question. What innovations are a byproduct of the Russian space program?
9 votes
0 answers
867 views

Roughly how many self-viewing cameras are present in a Falcon 9 LEO mission?

Watch any of last year's SpaceX LEO satellite deployment missions's broadcasts in YouTube, and you can see views from at least several different cameras. At least two on the 2nd stage nozzle, at least ...
  • 148k
9 votes
0 answers
434 views

How do domes in lunar impact melts develop, and might they be hollow?

On the floors of young craters of the Moon, smoothly rounded domes are visible in some spots. Lalande crater has 4 of them, each around 200 m across. Here are less regular ones on the floor of ...
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8 votes
0 answers
97 views

Dimorphos natural orbit variability vs DART impact

As we know, DART spacecraft have impacted Dimorphos, a satellite of Didymos. The impact will change the orbital period. Depending on the properties of Dimorphos (mass, porosity, cohesion), the period ...
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8 votes
0 answers
100 views

What is the cabling on the exterior of the SLS solid rocket boosters that wasn't on the shuttle solid rocket boosters?

I noticed what appears to be foamed-over cabling running roughly parallel to the systems tunnel on the exterior of the SLS Solid Rocket Boosters (SRBs). The cabling appears to run all the way from the ...
8 votes
0 answers
175 views

What are the negatives associated with Thrust-augmented Nozzles aka Afterburning Rocket Engines?

An interesting comment here introduced me to the concept of Thrust-augmented Nozzles aka Afterburning Rocket Engines. The pubs I've read on it so far introduce the concept as a way to provide good ...
8 votes
0 answers
108 views

How do people know how big the rocks are in the photos of Titan's surface?

How do people know how big the rocks are in the photos of Titan's surface?
8 votes
1 answer
380 views

Why aren't off-axis reflector telescopes more popular for space telescopes? Have there ever been any?

It seems that: The light gathering capabilities would be slightly better without the blocked aperture (clear aperture is a premium for fairing-limited space telescopes) The diffraction patterns from ...
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8 votes
0 answers
96 views

How does the JWST sunshade cover release work?

In animations of the James Webb Space Telescope unfolding, you see material rolling itself up to uncover the folded-up sunshade. How is that rolling-up process driven? The animations don't show any ...
  • 7,444
8 votes
0 answers
216 views

Silane as a rocket fuel

At about 6:55 into the video Why Moon Mining Will DEFINITELY Be A Thing it is stated that lunar silica (SiO2) could be turned into silane (SiH4), which is the silicon analogue of methane. It also ...
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8 votes
0 answers
172 views

With an external airlock attached, could Commercial Crew Program spacecraft service Hubble?

Note just to clarify: is not about the requirements of the Commercial Crew Program, it is about the as-built capabilities of Crew Dragon and Starliner (hereafter referred to as CCPS, CCP (not that one)...
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8 votes
0 answers
129 views

Is there any official Chinese website where we can follow the actions of the Zhurong rover?

Zhurong, China's first Mars rover, soft landed on Utopia Planitia on May 14, 2021. Coordinates of the landing site are: 25.1⁰ N 109.7⁰ E The planned operational lifetime is only 90 sols. (Why should ...
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8 votes
0 answers
239 views

Is the charge on Martian dust positive or negative?

Martian dust tends to cling to surfaces such as solar panels due to electrostatic charge. Martian dust is extremely small and fine-grained. Atmospheric dust on Mars is approximately three microns in ...
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8 votes
0 answers
111 views

Was the recent uncontrolled Chinese rocket de-orbit exceptional?

The recent (April 2021) Chinese CZ-5B rocket launch gained widespread media attention because the large launcher was designed to de-orbit in an uncontrolled fashion, and ultimately landed in the ...
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8 votes
0 answers
762 views

Is there anything that could speak 900 MHz ZigBee that could hear Ingenuity helicopter besides the Perseverance rover?

Interest is piqued by What could be strong arguments against Ingenuity following Perseverance at a safe distance when the flight test program has been a success? Question: Can anything at Mars, or ...
  • 148k
8 votes
0 answers
252 views

Perseverance individual sample collection post-mission; what stops them from blowing away or getting covered and hidden by dust?

I have been seeing videos that the plan after Perseverance is done collecting samples to distribute them in 'strategic' locations around Mars for another rover to drive around and pick up later. Why ...
8 votes
0 answers
52 views

Are there any sites that have collection of Bellcomm Inc. memos?

Bellcomm Inc was contracted by NASA to provide alternate and hypothetical launch vehicles, spacecraft, and missions. The memos combine the right blend of technical detail without heavy mathematics ...
8 votes
0 answers
138 views

How often have signs of life been dismissed as abiotic?

Today, there are rumors about an upcoming announcement of the discovery of (non-conclusive) evidence for life on Venus, apparently they detected some phosphorus compound that is not produced by any ...
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8 votes
0 answers
205 views

Roughly, how much of our Moon's apparent libration amplitude seen from the Geocenter is due to different effects?

My understanding is that when tidal locking of a body first happens it transitions from a state where the average rotation period is faster than the orbital period to a state where they are the same ...
  • 148k
8 votes
0 answers
325 views

What did NASA Vehicle Assembly Building's "weather" look like? Did it really have clouds? Did it rain?

Comments below this answer to Would there be snow, rain, fog or clouds in a deep, sealed, subsurface cavern on the Moon if water were present? point out that the NASA Vehicle Assembly Building ...
  • 148k
8 votes
0 answers
79 views

Escape system of SLS vs Ares I

One of the criticism directed at the Ares I rocket was the danger during a launch termination of the solid-propellant 1st stage. As far as I understood it, a terminated Titan IV solid-propellant ...
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8 votes
0 answers
144 views

What is the speed of crew Dragon upon splashdown?

After reentry, what is the speed of the Dragon 2 capsule right before splashdown? What g-force is received upon splashdown? At the time of writing, this answer gives such information for many other ...
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8 votes
0 answers
268 views

Will SpaceX paint over the NASA Worm on booster 1058 for its next flight?

For the Dragon Crew mission SpaceX flew a brand new booster (how declasse) B1058 and painted it with the old style NASA Worm logo. SpaceX owns the booster and is most likely to fly it many more times ...
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