74
votes
Accepted
Did a Soyuz fly with a Union Jack?
The USSR's next-to-last crewed launch was Soyuz TM-12, flying to Mir, carrying two Russians and the UK's first astronaut, Helen Sharman.
Here's a photo of TM-12 on the launch pad with the UK flag ...
- 164k
62
votes
Accepted
What are these things fired away from a ballistic missile at launch?
If you use the YouTube commands for single framing ( , and .) you can clearly see the rocket retaining rings around the body ...
- 6,143
62
votes
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In this iconic lunar orbit rendezvous photo of John Houbolt, why do arrows #5 and #6 point the "wrong" way?
They are burns, with the direction of the arrow roughly indicating the direction of thrust.
Ascent
Earth orbit insertion
Trans-lunar injection
Midcourse correction
Lunar orbit insertion
Burn to drop ...
- 171k
59
votes
Accepted
Why is there a Saturn V in the background of this Gemini-Titan launch?
The photo is of the launch of Gemini 11 on September 12, 1966. The Saturn V in the background is SA-500F, a "Facilities Integration Vehicle". This was a nearly complete Saturn V that was ...
- 164k
55
votes
Why does there appear to be a 180-degree stereo microphone array outside the ISS?
That is a UHF antenna. It was well placed on the Lab to get in the way of robotics ops during space station assembly.
This is a picture of a different UHF antenna unit (this one is on the P1 truss ...
- 171k
54
votes
Accepted
What caused this bright light from the ground at night seen from the ISS?
Well I confirmed via Google Maps that this is Mecca. As shown in the map and image below the roads align with those lighted in the image. The dark areas in the first image are steep hills to the ...
- 2,291
54
votes
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What are the 'lights' inside Shuttle main engines at landing?
It's simply the spotlights illuminating the ship, and shining up the bore of the engines. Notice the shadows of the vertical stabilizer from the same source.
When the shuttle landing direction is ...
- 171k
50
votes
Accepted
Why is this part of the Space Shuttle launch pad suspended so high off the ground?
That is the Rotating Service Structure.
It can be rotated to fit over the Shuttle while it is on the pad, giving access to the Shuttle cargo bay. The empty space allows the RSS to fit over the ...
- 123k
48
votes
"Pillars of Baikonur" What is the purpose of the hundreds of short, white posts near the Baikonur Cosmodrome launch pad?
I found this article on the site of the Russian news agency Vesti.
Подземный бункер пуска - самое близкое к старту место. Над ним специальные бетонные столбики, так называемые волнорезы, чтобы ...
- 8,896
44
votes
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Why does the Minotaur I wear a yellow jacket that "banana-peels" off as it launches?
The jacket is to control the Propellant Mean Bulk Temperature, a critical factor in solid rocket motor performance.
The silos for the missiles that the launcher was derived from were air-conditioned ...
- 171k
43
votes
Accepted
What celestial body did NASA carve and why is it eating a spacecraft?
That's Saturn eating Cassini (remember Cassini's entry into Saturn's atmosphere at the end of its mission).
- 123k
39
votes
Accepted
What were the "pills" that were added to solid waste in Apollo 7?
In order to prevent bacteria in the solid waste from producing gas, which could rupture the storage bags, a germicide was added to the bag after use and "kneaded in" to mix it with the waste once the ...
- 164k
39
votes
Apollo Command Module heatshield tube - what was it for?
That is the remnant of one of the attachments between the Command and Service modules (there were three). Here is a cutaway drawing showing the bolt penetrating the heat shield (labeled "tension tie")...
- 171k
38
votes
Accepted
What spacecraft control is Margaret Hamilton pressing in this picture?
It's the ECS RADIATORS / HEATER / PRIM 1 - PRIM 2 switch.
from here
Having given many tours of the cockpit in the shuttle simulators, it's very common to have someone say "Turn around for the camera ...
- 171k
38
votes
Accepted
Function of the separated, individual solar cells on Telstar 1 and 2? Why were they "special"?
The small separated cells had several functions.
Six individual units, the "solar aspect cells", were each oriented and attached as if they were on the sides of a cube to identify the spacecraft's ...
- 12.5k
34
votes
Accepted
What is the function of this (apparently) fixed dish on the ISS?
That's a spare part - a spare Space to Ground Antenna dish for the Ku band. It's mounted on an External Stowage Platform. It was brought up on STS-127.
From the STS-127 Press Kit Mission ...
- 171k
34
votes
Accepted
What is this pin on John Glenn's suit jacket?
It's the Project Mercury / Mercury Seven emblem.
The astronauts went under the name Mercury Seven, and the program design includes the number seven. The symbol represented around the seven is the ...
- 171k
33
votes
Accepted
What is this large fan in front of the Space Shuttle during Ground Turnaround?
It turns out, my first hunch was half-right: the purpose of this large fan is not so much to carry away, but to disperse both toxic and explosive chemicals.
It is called the Vapor Dispersal Unit, and ...
- 16.8k
33
votes
What is the orange material seen within the window frames of the Columbia Shuttle?
I can address "its precise function" although I don't know exactly what it was made of.
The pressurized crew compartment aka "crew module" of the shuttle Orbiter was a separate ...
- 171k
33
votes
What is the rotating gold object on the outside of ISS?
The spinny thing is the 75cm reflector of the COWVR (Compact Ocean Wind Vector Radiometer).
The whole package is known as STP-H8 and is composed of three instruments: COWVR, TEMPEST, and GARI-2 (...
- 6,697
32
votes
Accepted
What's on the bottom of the Shuttle's external fuel tank?
It is an access hatch used during construction and maintenance.
Credit: NASA-KSC
Credit: NASA
This part got at least some media coverage during the scrubbing of STS-121, when a Engine Cutoff (ECO) ...
- 3,372
31
votes
Accepted
What is the purpose of the rotating dish antenna on the ISS
You probably mean RapidScat. It is a microwave scatterometer that measures near-surface wind speed and direction.
Here's RapidScat in action, installed on Columbus module's External Payloads ...
- 58.2k
31
votes
Does anyone recognize these rockets, and their location?
Just to add to @Jack's correct answer you can see the rockets in Ibaraki, Japan via Google Maps, you can see the two rockets (and even make out the red rocket part):
(Just FYI - I screenshotted your ...
- 1,063
29
votes
Accepted
What is the function of the corrugations on a section of the Space Shuttle's external tank?
That's the intertank - the cylinder that connected the bottom of the LO2 tank to the top of the LH2 tank.
It didn't contain propellant, but did contain the forward interface with the Solid Rocket ...
- 171k
29
votes
Apollo Command Module heatshield tube - what was it for?
Service module attachment point
The service module (SM) was attached to the command module (CM) using tension members which pulled the two modules towards each other. The SM used cups that rest on ...
- 521
29
votes
Accepted
Cartoon-like characters on the side of the Tianwen-1 Mars lander?
The cartoon characters are the mascots for the 2022 Winter Olympic games & the Winter Para Olympic games.
The panda figure on the left is for the Olympic Games and the red figure of the right is ...
- 12k
28
votes
Accepted
What are the small gas jets at the rims of the Space Shuttle Main Engines?
The lines that exited at the end of the nozzle were drain lines carrying leakage from seals, output of hydraulic actuator drain lines, etc. The following schematic shows the various systems attached ...
- 171k
28
votes
Why is there a white panel in astronaut’s fabric headcover they wear inside the hard helmet?
This is called a Snoopy Cap.
It's a hood that holds the communications headset to the astronaut's head.
The white portion is elastic fabric to make the cap fit snugly; the black portions are a non-...
- 8,548
27
votes
What spacecraft control is Margaret Hamilton pressing in this picture?
Organic Marble beat me to it, but in the interest of teaching people to fish:
There's a handy panel locator figure which subdivides the command module control panel into several lettered areas as ...
- 164k
27
votes
Accepted
What are SpaceX's Starship's header tanks?
This has been answered before, but I chose not to just mark it a duplicate because there is one new reason for the header tank unique to Starship.
In a Reddit AMA in 2017 where Elon Musk answered ...
- 2,153
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