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6 votes
2 answers
380 views

Hubble gyro manufacturer

I have been trying to find information on Hubble's gyros. So far all I have found is that they are rotating mass rate gyros with gas bearings and that the were the most accurate available when ...
John McCarthy's user avatar
11 votes
1 answer
2k views

What is the goal of the message “astronaut use only” written on one Hubble's module?

On the following image, why is it written “astronaut use only”? Since this power control unit is in space, it can only be used by astronauts. So why write this message? Cropped from this image: ...
A.L - say no to AI's user avatar
4 votes
2 answers
86 views

What propellant (coolant) mass is required for an actively cooled heat shield?

Stoke Space are using a regeneratively cooled heat shield to allow their second stage to survive re-entry. The basis of the design flows LH2 through the aeroplug, then using the heat captured to power ...
Barry Jenakuns's user avatar
15 votes
2 answers
2k views

Eye Spy: Where are the other two (of six) vehicles docked to the ISS in this Maxar image (& what are they?)

I spy Crew Dragon, Starliner, & two Progress (?). Where are the rest? (Credit: https://www.maxar.com/maxar-intelligence/products/non-earth-imaging)
Anton Hengst's user avatar
  • 10.8k
1 vote
0 answers
16 views

Link to the Mars Exploration Rover mission updates archive

Would anyone know where I can find the (archived) mission updates for the Mars Exploration Rover missions? I remember NASA / JPL used to post mission updates every few sols but unfortunately, I can't ...
olamarre's user avatar
  • 907
1 vote
2 answers
190 views

How precise does Super Heavy's tower landing have to be?

What is the position and velocity range it needs to fit in, to be safely caught by the Orbital Launch Mount?
Abdullah is not an Amalekite's user avatar
1 vote
0 answers
61 views

RL10 Injector Plate

Could anyone enlighten me with this puzzle ? The following frames are screenshots from an P&W RL10 engine's video. It's actually the top view of Fuel Injector Manifold and the LOX/Injector Domes (?...
user3184199's user avatar
3 votes
2 answers
192 views

How is Starship longitudinally stable during reentry?

During IFT-4, it was noted that the flaps rarely moved. But I don't understand how Starship would be stable at that attitude. Stability requires the center of pressure to move rearward with increasing ...
Abdullah is not an Amalekite's user avatar
2 votes
0 answers
58 views

Does the SpaceX Crew Dragon need any modifications for circumlunar flight?

Does it need upgraded heat shields, communication gear, or anything else? Or can we just put it on a Falcon Heavy and do it now?
Abdullah is not an Amalekite's user avatar
4 votes
3 answers
182 views

Has IFT-4 demonstrated that Starship is ready to enter service?

IFT-4 demonstrated a controlled entry into orbit. IFT-3 had already demonstrated the ability to open the payload bay door (or so SpaceX claims). Is there any reason why Starship cannot begin launching ...
Abdullah is not an Amalekite's user avatar
-2 votes
0 answers
70 views

What's your space exploration question? Be specfic [closed]

Include all the information someone would need to answer your question
user55325's user avatar
5 votes
2 answers
1k views

What's the difference between cryogenic and Liquid propellant?

According to my understanding (which may be incorrect), the cryogenic form and liquid form of propellant both use a fluid as an oxidizer and fuel. Research tells me crygenic propellant is more ...
Aerospace_Nerd's user avatar
10 votes
6 answers
3k views

Starlink Satellite Orbits

Why do Starlink satellites orbit so fast around the Earth, approximately every 90 minutes or so? Why are they not in geostationary orbits?
andro's user avatar
  • 613
6 votes
1 answer
75 views

Did Mariner 9 have a magnetometer?

While doing research for this question, I found conflicting info on Mariner 9. There are websites that say it included a magnetometer, such as here and here. But NASA's site doesn't list it and ...
Mqrius's user avatar
  • 560
2 votes
2 answers
655 views

Is the angular orbital velocity of a satellite in a circular orbit constant?

I know that the angular orbital velocity of a satellite in a circular orbit is $w_0=\frac{v}{r}$ but I want to know if the angular orbital velocity of a satellite in the circle orbit is constant. I ...
user212662's user avatar
-3 votes
0 answers
105 views

Too many questions about moon landing [closed]

So I have a few questions how did the astronauts unload them unfold then install the heavy batteries on the lunar Rover with their space suits on? Who took the pic of Armstrong if he was 1st on the ...
Ron's user avatar
  • 1
10 votes
2 answers
1k views

Do we know how the SpaceX Starship stack handles engine shutdowns?

During the launch of SpaceX's Starship flight IFT-4 (unofficial cut video), a few seconds in one Booster engine was marked as shut down: Later, around time T+2:45, the rest of the Booster engines ...
Ahmed Tawfik's user avatar
2 votes
2 answers
182 views

What's the purple glow in SpaceX Starship's IFT-4 re-entry video?

During re-entry, SpaceX's Starship flight IFT-4 video stream showed an initial reddish glow (link to cut video stream, not official video). However, later on, the color of the glow turns purple. At ...
Ahmed Tawfik's user avatar
4 votes
1 answer
215 views

What is the advantage of the "Mechazilla arms" over fitting the Super Heavy booster with landing struts?

SpaceX lands the Falcon 9 booster stages on its built-in landing struts, this works well. However, the plan to land the Super Heavy booster stage is to capture it in a set of mechanical arms dubbed &...
Frank van Wensveen's user avatar
12 votes
1 answer
940 views

Why does the proposed Lunar Crater Radio Telescope suggest an optimal latitude of 20 degrees North?

In the proposal for NASA's Lunar Crater Radio Telescope, it claims that one of the key requirements is a "location on farside near ≈ 20°N and 180° ±45°E to avoid Earth-based radio interference ...
Thane Brimhall's user avatar
16 votes
3 answers
5k views

Is it true that engines built in Russia are still used to launch American spacecraft?

Is it true that today's launch of the American spacecraft Boeing Starliner still used Russian-made engines?
VALERIAN's user avatar
  • 301
5 votes
2 answers
185 views

Why radiation hardened processors are designed to withstand so large total ionizing doses?

I took a look at the Preliminary Radiation Analysis of the Total Ionizing Dose for the Resource Prospector Mission paper and was quite surprised to find how "low" total radiation doses ...
xfii's user avatar
  • 53
11 votes
4 answers
3k views

How do satellites operate below their operating temperature?

As we all know, space is a vacuum and doesn't support "temperature" too well. However, when a probe is placed away from a star, the temperature is quite enough to damage electronic ...
Aerospace_Nerd's user avatar
1 vote
0 answers
67 views

Stars (other than Sol) resolvable as disks [migrated]

Have any stars (other than Sol) been imaged as actual disks (the way we've seen the planets and moons of our solar system)? Presumably such a star would be relatively close to us and/or relatively ...
Anthony X's user avatar
  • 17.6k
7 votes
0 answers
105 views

Does Chang'e 6 try to avoid sampling contaminated soil?

Watching this amazing video of Chang'e 6 taking samples from the Apollo Crater on the far side of the Moon, I was struck by the proximity of the sample channels to the lander. It's understandable ...
Dave Gremlin's user avatar
  • 2,961
2 votes
0 answers
92 views

Rocket Launch Azimuth Calculation

EDIT: I have come to understand how gravity causes, or at least causes it to appear that, trajectories move toward the equator since any possible orbital plane would require the center of the earth as ...
rymach's user avatar
  • 21
1 vote
0 answers
71 views

How to implement the TVC missile control method? [closed]

The TVC method allows you to control the flight course of the rocket and return it to an upright position when deflected. I've seen a lot of videos on YouTube about creating such a system, in ...
DYNAMIC AEROSPACE's user avatar
2 votes
1 answer
211 views

Could the Dream Chaser be launched to the ISS with a Falcon 9 rocket?

It seems to be the ultimate marriage of 2 reusable systems. It pains me to watch people struggle with old-style parachute recovery capsules and disposable rockets. The combination of the two would be ...
Robert DiGiovanni's user avatar
4 votes
1 answer
219 views

What proportion of the total fuel load in a Saturn V was used to drive the pumps?

In a liquid propellant rocket, power is needed to pump propellant against the pressure inside the combustion chamber. The Rocketdyne F-1 reportedly used 55,000 HP to drive the pumps. What proportion ...
Woody's user avatar
  • 22.4k
3 votes
1 answer
123 views

How well does a sea-level engine operating in a vacuum perform compared to a vacuum-optimized engine operating in a vacuum?

A sea-level rocket engine generally has a smaller bell than the equivalent model vacuum-optimized engine - and is perhaps a little bit lighter because of that. I assume that there could be other ...
phil1008's user avatar
  • 6,176
5 votes
1 answer
163 views

How does a liquid rocket engine prevent the combustion from going back in? [duplicate]

To my knowledge, the liquid engines usually utilize a turbopump to gush fuel into the combustion chamber. Later that fuel is mixed and injected in a mist form through the injector to be ignited. ...
Aerospace_Nerd's user avatar
2 votes
0 answers
45 views

Finding satellite visibility with ephemeris state vectors instead of TLE

I have been using Python excellent skyfield module to compute Earth satellite events from a given point (ie. visibility—rise, culmination, and set, as well as ...
M2FKXY's user avatar
  • 173
4 votes
1 answer
201 views

Is there any film of Saturn V Stage 1 falling to the ocean?

Although there were more than ten Saturn V launches and the first stage separation is clearly visible, I have never seen any tracking of the huge first stage as it fell 100 km back to the Atlantic ...
Robert Martens's user avatar
1 vote
1 answer
93 views

Apollo Third Stage SLA Separation design change?

Did NASA change the design of the SLA on the Apollo third stage? First leaving it connected and then having the panels separate from the third stage?
Robert Martens's user avatar
5 votes
2 answers
1k views

Is the Rocket Lab launch scheduled for May 31 only launching a tiny cubesat?

According to Rocket Lab's website, their Electron can launch 300kg to low Earth orbit. But the PREFIRE cubesat, according to NASA is a 6U cubesat with an 'average weight' for 6U cubesats of .91kg. I ...
dsteele's user avatar
  • 153
7 votes
1 answer
2k views

What is the maximum number of times a liquid rocket engine has detonated/ exploded during development?

My question comes from a lot of research and curiosity. Do they stop the development process at 10-20 detonations/ explosions? Or do they keep continuining solving one problem after the other. Modern ...
Karthikumar Sambasivam's user avatar
3 votes
2 answers
739 views

Moons rotation about its own axis [closed]

Since the moon is tidally locked with earth, we always see its same face. How then did we realize that the moon may also be rotating about its own axis?
Niranjan's user avatar
  • 3,796
5 votes
2 answers
903 views

Are Hybrid Rocket Motors still in use?

There's always an outlook for liquid propellant and solid propellant rocket engines along with detonation engines and so on. But I hear very little about hybrid engines, have they simply been ...
Aerospace_Nerd's user avatar
10 votes
1 answer
2k views

How exactly does the JWST (James Webb Space Telescope) "see" light from so far away? [closed]

As commonly known, the James Webb Space Telescope (JSWT) has been sent to Lagrange point 2 (L2) to receive reports from the past of the universe, and it does this by measuring several factors such as ...
Aerospace_Nerd's user avatar
5 votes
3 answers
1k views

Permanent living on Maglev train on the Moon as a colony

NASA is considering a proposal to build a levitating train system on the Moon. The Moon's surface is often flat and smooth. Maybe building a mobile train colony similar to the movie Snowpiercer on the ...
estinamir's user avatar
  • 401
-2 votes
1 answer
163 views

Late 19th century rocket design [duplicate]

Would it have been possible to build a moon rocket in the 19th century using then-existing technology? In 1890s France, Pedro Paulet supposedly tested a small liquid-fueled rocket using dinitrogen ...
bentmoltheringer's user avatar
3 votes
0 answers
75 views

Mean motion as indication for satellite (evasion) maneuvers

I am interested in detecting satellite maneuvers, e.g., to avoid collissions. As far as I understand the best publicly available data comes from TLEs although they have their own problems. What is the ...
Adrian's user avatar
  • 159
6 votes
0 answers
121 views

Has the continued monitoring of the Voyagers probes been in danger of being discontinued, and if so, how many times?

I assume the continued monitoring of the Voyager probes has been part of the annual NASA appropriations and authorization, NASA Appropriations and Authorizations: A Fact Sheet, for example. Have there ...
Bob516's user avatar
  • 6,999
2 votes
1 answer
153 views

Could Phobos or Deimos be a good target for mining?

Phobos could be loaded with iron, magnesium, and other metals of sorts. Because of the mineralogy of the moon, could it become a useful target for future plans similar to asteroid mining? Phobos and ...
classof2024's user avatar
3 votes
1 answer
199 views

How was it determined that 1977 was best time to launch voyagers for "grand tour"

Was it multitudinous mathematical trial runs that determined that 1977 was best time within a 176 year period to launch the voyagers? Initial launch was to obtain close encounters with Jupiter and ...
tckosvic's user avatar
  • 2,302
-2 votes
1 answer
137 views

Can robots take the jobs of humans in space? [closed]

Until recently, it seemed that robots would never be able to reason and think like humans. Now it is clear to everyone that they can. It is only a matter of time before AI is joined by an adequate ...
Saturn V's user avatar
  • 1,335
9 votes
2 answers
4k views

Can Maglev trains ever reach escape velocity?

NASA is planing to build a levitating train system on the Moon. For Moon, would it be possible to build a large scale system equivalent to maglev trains, to accelerate (for example) a mining cart of ...
estinamir's user avatar
  • 401
4 votes
1 answer
110 views

Did the ISS CREAM experiment actually get relocated?

A recent update (May 22) to the database for the NASA visualization tool DOUG shows that the CREAM payload has been relocated to the top of the Japanese Experiment Logistics Module - Pressurized ...
Organic Marble's user avatar
4 votes
0 answers
87 views

Testing astrodynamics software [closed]

As I’ve been developing my own solutions (and implementing existing ones) to problems in astrodynamics to solve textbook questions and to build applications, I’m becoming increasingly interested in ...
gaharaz's user avatar
  • 121
0 votes
0 answers
20 views

Issue in orbit propagator with wmm2020 output

I am trying to build an orbit propagator with input of latitude and longitude in wmm2020 to plot the magnitude of the geomagnetic field. The orbit seems good but the field plot is completely wrong. ...
Felipe JulianoDev's user avatar

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