Skip to main content
22 votes
Accepted

What was the Modified Apollo option for a potential LEO transport?

It likely refers to the MODAP (MODified APollo) aka Apollo Logistics module. This was a proposal for modifying the Command Module to support six crewpersons and adding cargo space to the Service ...
Organic Marble's user avatar
16 votes
Accepted

What are the "insect antennae" on the MMU (Manned Maneuvering Unit)?

Found a 2nd source so removed "partial answer notation" (still looking for details on what the lights actually indicated). The "antennae" are cue light extenders. (From Aviation ...
Organic Marble's user avatar
13 votes
Accepted

Why does this "Midas missile early warning satellite" have a tilting cone with such a complex black-and-white checkerboard pattern?

This is a two component question: Why the tilted cone? Why the complex checkerboard pattern? The Angled Cone Answer: The tilted cone is the rotating sensor telescope From https://space.skyrocket.de/...
Woody's user avatar
  • 21.6k
12 votes
Accepted

What are these things on the side of the GSLV Mk 3 SRBs?

Hydraulic fluid tanks for the solid boosters' blow-down thrust vector control system. https://en.wikipedia.org/wiki/LVM3 FNC = Flex Nozzle Control https://web.archive.org/web/20211011095054/https://...
Organic Marble's user avatar
11 votes
Accepted

What are those yellow trussed structures on Hubble Space Telescope?

They are indeed the trunnion pins used to hold the scope in the Shuttle's payload bay during launch. Labeled in this paper about re-entry analysis of the scope: https://www.hou.usra.edu/meetings/...
Organic Marble's user avatar
7 votes

What is this complicated experimental apparatus being pulled out of another complicated apparatus inside the ISS?

That is the Combustion Integrated Rack (CIR) with its MDCA (Multi-user Droplet Combustion Apparatus) insert. This paper has a lot of technical details on CIR. The MDCA is capable of dispensing and ...
Doresoom's user avatar
  • 1,754
7 votes

What is this complicated experimental apparatus being pulled out of another complicated apparatus inside the ISS?

It is the Multi-user Droplet Combustion Apparatus, inside the station's Combustion Integrated Rack (CIR.) The CIR houses hardware capable of performing combustion experiments to further research of ...
Woody's user avatar
  • 21.6k
7 votes

Very slow blinking object — high orbit satellite or some balloon? Any idea?

Answer: Tumbling satellite in high inclination (>90°) Mid Earth Orbit I’ll assume your binoculars are tripod-mounted without a motor drive mount since the star field is moving uniformly. Since the ...
Woody's user avatar
  • 21.6k
6 votes

Why is a cartoon character visible in the artist's rendition of the McDonnell Douglas X-33 proposal?

It is (an early version of) the logo of the Phantom Works, the advanced R&D arm of McDonnell Douglas, now Boeing. https://en.m.wikipedia.org/wiki/Boeing_Phantom_Works Current version of logo. ...
Organic Marble's user avatar
6 votes
Accepted

What are these weird things on the McDonnell Douglas X-33?

The appendages that you are referring to are most likely gaseous hydrogen thrusters. In the middle is a liquid hydrogen engine. In 1995 during Phase I of the X-33 program NASA received proposals from ...
Steve Pemberton's user avatar
5 votes
Accepted

What's that material on the Varda capsule that looks like cake sugar icing?

According to the FAA document Environmental Assessment for Reentry, Landing, and Recovery Operations of a Varda Space Industries Capsule within Utah Test and Training Range (UTTR) South or Northern ...
Organic Marble's user avatar
5 votes

On the ISS what is that frame with a criss-cross of rubber bands?

That's the Microgravity Rack Barrier protecting FIR (Fluids Integrated Rack) from disturbances while it's utilizing the Passive Rack Isolation System (PaRIS) during science ops. Both CIR and FIR use ...
Doresoom's user avatar
  • 1,754
3 votes

What is this device/object that the SpaceX astronauts are holding?

I believe it's CDN PT2 kitchen timer. In shuttle era PT1A was used.
user52175's user avatar
3 votes

What rocket engine is this?

It turns out that this is a RS-68 engine, which is a hydrolox gas-generator cycle. I think it's a fuel-rich preburner gas-generator, at least. But it's at least not a form of staged combustion cycle ...
fyrepenguin's user avatar
  • 1,663
3 votes

What are the "insect antennae" on the MMU (Manned Maneuvering Unit)?

AFAIK, and it is hard to find a lot of info atm, they are for the propellant gauges. They supply information. https://ntrs.nasa.gov/api/citations/19910009290/downloads/19910009290.pdf Thruster Lights ...
blobbymcblobby's user avatar
2 votes

What are these things on the side of the GSLV Mk 3 SRBs?

Apart from the other answer: In the future, these structures will be used to house the batteries (and perhaps other electronics) for the electro-mechanical actuation system (which will replace the ...
AJN's user avatar
  • 1,030
2 votes

What is the object seen in this Apollo 11 film?

Answer: Artifacts. But what produced the artifacts??? Definitions: Artifact: something observed in a scientific investigation or experiment that is not naturally present but occurs as a result of the ...
Woody's user avatar
  • 21.6k
2 votes

Very slow blinking object — high orbit satellite or some balloon? Any idea?

I too have observed the same thing. I am using ANVS 7 NVG goggles and can see a dim light strobing like an aircraft anti-collision light coming from deep space. I guarantee it's not an aircraft being ...
Robert Martinez's user avatar

Only top scored, non community-wiki answers of a minimum length are eligible