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Most likely trajectory of the Gravity Probe A spacecraft, and location of the microwave maser receiver on Earth?

Background/motivation @PM2Ring's comment under an answer to "Is there a wavelength shift between sunlight observed from the ISS versus from Earth's surface?" in Physics SE links to the ...
uhoh's user avatar
  • 148k
2 votes
2 answers
24 views

Diagonal ice tunneling rover to reach a safe pressure in Mars?

Is the ice on Mars deep enough to bore down into it to sustain around 10 PSI air pressure? The device I have in mind is a rover with a reactor that melts threw the ice slowly to create a stable tunnel....
Justintimeforfun's user avatar
1 vote
0 answers
25 views

How to find the velocity vector of a planet in orbit without inclination, argument of periapsis, or longitude of the ascending node?

For a personal project, I am creating a fictional planet using as much actual science as possible. As the title suggests, I only have three of the orbital elements and wish to calculate the velocity ...
user56533's user avatar
5 votes
2 answers
128 views

Rocket Nozzle Shape and Length

How is the efficiency of a particular nozzle shape with a given length calculated? To clarify what I'm not asking for: I understand the idea behind the de Laval nozzle, where you constrict the flow ...
ScienceSnake's user avatar
1 vote
0 answers
52 views

How are solid rocket propellants stored?

Unlike Liquid Propellants, solid propellants are already mixed with each other. I've always wondered, does that propellant ever go "bad"? and if it does, how do they prevent it from doing so?...
Aerospace_Nerd's user avatar
-5 votes
1 answer
46 views

Why can't we smash asteroids into Mars so it will move closer to the sun for colonization of the planet

It would take a concerted effort to make this happen.
Peter Shackelford's user avatar
2 votes
0 answers
33 views

Accuracy of MRO ephemeris

I am trying to understand if I pick a point on the Martian surface, say the Airy-0 Crater, with what accuracy can I predict the earth time the MRO will pass directly overhead? It's my understanding ...
LMcGregor's user avatar
-1 votes
0 answers
110 views

Orbital Mechanics code not working [closed]

I'm trying to make a code that will simulate the orbit of a satellite around the moon with the Earth as the reference frame. I'm struggling because whenever I plot the variation of the orbital ...
Anthony's user avatar
  • 27
2 votes
0 answers
92 views

Was the July 29th EVA cancelled?

I no longer see the announcement of the July 29th EVA on Nasa TV's website. Was this cancelled and if so, why?
ray's user avatar
  • 479
3 votes
0 answers
57 views
+100

Are there any plans to carry out more parallax observations using New-Horizons?

In 2020, New Horizons famously carried out observations of Proxima Centauri and Wolf 359 as part of an experiment to observe the parallax difference between Earth and the spacecraft. Are there any ...
Dave Gremlin's user avatar
  • 3,093
-1 votes
1 answer
76 views

How much energy is used for a Starship launch? [duplicate]

I want to understand how Earth will support the thousands of Starships Musk envisions. I'm talking about the energy expended in all launch-related processes: propellant generation, transportation, ...
Abdullah is not an Amalekite's user avatar
3 votes
1 answer
118 views

Why does an expendable Starship launch cost only $100 million?

Even the Falcon Heavy with a third the payload costs $150 million. And yet we have Payload Research saying that an expendable Starship launch costs less?
Abdullah is not an Amalekite's user avatar
5 votes
3 answers
2k views

Reducing required length of a mass driver using loop?

If you had a loop of electromagnets with an encapsulated payload inside vacuum tubes, how fast could you accelerate the capsule to before it reached some maximum velocity? What effect would scale have ...
FellahWithNoMentalModelsHere's user avatar
4 votes
0 answers
51 views

GMAT Lambert problem

I would like to plan a mission in GMAT to a certain asteroid, whose orbit and SPK file I have added in GMAT. However, I don't know how to solve the Lambert problem in it to first find the intersection ...
Arkadiusz Hess's user avatar
6 votes
1 answer
161 views

What does Paul Birch mean by kg * s^-1 * kg^-1?

In Paul Birch's paper, Terraforming Venus Quickly he mentions a unit kg * s^-1 * kg^-1, which I interpreted as ($\frac{kg}{kg \cdot s} = \frac{1}{s}$). This is a valid unit, representing a rate. ...
The Rocket fan's user avatar
5 votes
2 answers
1k views

Is the set of software and hardware of modern attitude control systems exhaustive?

In the book ADCS - Spacecraft Attitude Determination and Control on page 426 there is a diagram of the JWST ACS. Next I attach a reproduction of it from the book. The diagram shows the main soft- and ...
ayr's user avatar
  • 297
5 votes
3 answers
109 views

Satellite slew rate with respect to a ground station

For a given satellite orbit and observation time, I have the vectors containing the elevation and azimuth angles of the satellite with respect to a ground station. I know that the elevation slew rate ...
Carla Cantore's user avatar
8 votes
1 answer
522 views

Has Blue Origin carried out any flight or landing tests of the New Glenn first stage?

New Glenn is scheduled to launch the EscaPADE probe to Mars in the September launch window. I've read a lot about ground systems testing and prospective BE-4 static fire tests, but can't find ...
Dave Gremlin's user avatar
  • 3,093
16 votes
2 answers
4k views

How do cables and cooling lines transverse the pressure hull of the International Space Station?

The International Space Station (ISS) is notable for having large amount of unpressurized equipments on its Integrated Truss Structure (ITS), including the solar panels and the radiators. The electric ...
Mys_721tx's user avatar
  • 1,138
3 votes
0 answers
177 views

What caused the LOX leak on Falcon 9?

On July 11, 2024, the second stage of the Falcon 9 had a LOX (Liquid Oxygen) leak in the second stage and it couldn't perform SES-2 (the second upper stage burn), causing the Starlinks onboard to be ...
Starship's user avatar
  • 3,756
9 votes
1 answer
2k views

Can Falcon Heavy be used as a temporary replacement for the Falcon 9?

Due to an anomaly with the second relight of the Merlin engine on a Falcon 9 Starlink mission, the FAA has grounded the falcon 9 and will conduct a mishap investigation. Can falcon heavy be used as a ...
The Rocket fan's user avatar
6 votes
1 answer
290 views

Why don't rocket engines use heat tiles on the inside?

I asked in chat about rocket engines not melting @ 3300°C despite steel melting at 1400°C. The two excellent answers were: thermal mass was one answer the propellants are often piped through tiny ...
Vorac's user avatar
  • 599
5 votes
2 answers
2k views

How do satellite trackers work when showing a "satellite"?

There are multiple sat trackers online where you can follow spacecraft orbiting Earth such as the ISS or the HST. I wonder how those trackers actually work when showing something near Earth, as the ...
Little Mind's user avatar
3 votes
2 answers
92 views

What's the numeral name of the recently launched Starlink satellites and where can I track them?

I'd like to track the recently launched Starlink sats that reached a too low orbit due to the Falcon 9 second stage leak and MVac Engine RUD. For some reason, if I wanna enter "Launch 11 July ...
Little Mind's user avatar
4 votes
0 answers
187 views

Why did Starship lose an engine on IFT-4?

By T+0:00:06 at the latest, the Super Heavy carrying Starship for Integrated Flight Test 4 appears to have lost an engine (source and image). I know it's not a huge deal, as they can complete missions ...
Starship's user avatar
  • 3,756
3 votes
2 answers
2k views

Has a rocket engine ever been reused by a second/third stage

While rockets are basically minimal fuel tanks*, engines are steel monsters that aught to both weight much and be expensive to manufacture**. Has there ever been tried discarding the depleted fuel ...
Vorac's user avatar
  • 599
4 votes
1 answer
154 views

What are the tradeoffs in propellant choices for ion/electric based engines?

I'm under the vague impression that ion engines can use most things for propellant. What are the trade offs that influence selection, with an eye specifically towards oxygen? (Interested in the ...
user2702772's user avatar
  • 1,114
3 votes
1 answer
184 views

Would it be possible to create a relatively permanent Kessler syndrome event in interplanetary space between Earth and Venus?

A lot of interplanetary space infrastructure would be focused around Lagrange points, where collision energies would be very low. The threat in this case would come from everything traveling between ...
rhobot's user avatar
  • 33
0 votes
1 answer
78 views

Does the size of a black hole increase with mass? [closed]

I understand that extremely minute black holes can have a lot of mass. For example, A Black hole with a 120 pm radius, like a Hydrogen atom, would have a mass of 3.73x10^67 kg. Is this mass already ...
Aerospace_Nerd's user avatar
6 votes
1 answer
208 views

Are there any video/audio recordings of the launch of sputnik 1?

I've been researching the launch of sputnik 1, it is often renowned as the event that started the space age though I cannot find any confirmed videos of the launch or even a countdown/audio recording ...
ArchiveOfStars's user avatar
5 votes
1 answer
135 views

What's the theoretical dV of the SNAP-10A satellite?

SNAP-10A, launched in 1965, was the first nuclear reactor tested in orbit. It was intended to produce 500 watts of electricity for a year, but it only lasted 43 days; a voltage regulator in the ...
Mercury1964's user avatar
3 votes
1 answer
122 views

Is it possible to easily change the inclination when using momentum exchange tethers?

Access to space using Momentum exchange tether (like Skyhook, Space elevator,...) is economical, but only to specific orbits. And changing the inclination of the orbit is very uneconomical. Is there ...
Ember Edison's user avatar
9 votes
1 answer
193 views

Does an interplanetary trajectory exist to escape the Solar System and impact the Sun "simultaneously"?

This question is inspired by Do you need 0 km/s velocity to crash into the sun? which brings up the peculiarity (at least to the layman) of Solar System escape from 1 AU taking less $\Delta V$ than a ...
BrendanLuke15's user avatar
-2 votes
2 answers
157 views

Is perceived weightlessness greater in orbit due to constantly falling?

I'm familiar with $F_{g} = G\frac{m_{1}m_{2}}{r^{2}}$ and I was wondering if that means anyone orbiting the Earth actually experiences greater perceived weightlessness due to orbit itself compared to ...
cfx's user avatar
  • 105
4 votes
1 answer
1k views

Does it make sense to use a skyhook to launch and deorbit mega-satellite constellations now?

One issue with sky hooks is that to keep them spinning, they need to accelerate and decelerate the same amount of mass; otherwise, they would change their velocity and might even slow down so much ...
The Rocket fan's user avatar
2 votes
0 answers
57 views

Technical Question on Ignition Back Pressure

I am looking for understanding the backpressure or pressure stabilization of the injector inlet of the engines, during ignition (T-0). Are there books or papers that you suggest to check for ...
Irocket's user avatar
  • 111
2 votes
3 answers
182 views

Open air dock to space in a rotating space station?

Suppose you had a very large pipe, say 20 meters in diameter, open to space at the hub of a spinning station, and leading off radially from the hub towards the rim, where the pipe is sealed. After ...
demented hedgehog's user avatar
7 votes
1 answer
396 views

TWR of near-term NTR engines

With DRACO aiming for on-orbit demonstration of nuclear thermal rocket propulsion (NTR) in 2027, it seems like a technology that has had on-and-off interest for the last 70 years might finally become ...
ScienceSnake's user avatar
0 votes
2 answers
108 views

Could there be a difference to the human body between Low Earth Orbit “zero G” microgravity and midway between planets weak gravitational fields?

Would there be different effects on the human body (physiology, chemistry, psychology, other) over long periods of time if there was very very low gravitational field acting on it instead of being in ...
BradV's user avatar
  • 3,438
1 vote
1 answer
369 views

If the Van Allen Radiation Belt reaches temperatures of 35,000C, How is it possible to go through them when the craft has a boiling point of 4000C? [closed]

Van Allen Radiation Belt = 35,000C Boiling point of carbon fiber = 4200C Boiling point of Aluminum = 2470C
Emery's user avatar
  • 47
4 votes
1 answer
1k views

Are all Starship/Super Heavy "cylinders" 4mm thick?

Source The bodies of both rocket stages are made from stainless steel[18] and are manufactured by stacking and welding stainless steel cylinders.[19] These cylinders have a diameter of 9 m (30 ft) a ...
Abdullah is not an Amalekite's user avatar
2 votes
0 answers
95 views

Is Starship monocoqué?

Does Starship have any internal bracing to support it? Or is it a "balloon tank" relying on tank pressure to stand?
Abdullah is not an Amalekite's user avatar
4 votes
1 answer
127 views

What is the dark brown gas emission seen during the ascent of Starship?

During the video (see below) of Starship IFT-4 there is a lot of brown smoke or gas in the Superheavy exhaust from near the start for almost 30 seconds. Is this NO2? If so roughly how much is produced?...
Slarty's user avatar
  • 9,800
-2 votes
1 answer
77 views

How much propellent is vaporized to pressurize the Starship and Super Heavy tanks?

We know they use autogenous pressurization. But how much methane and oxygen is vaporised to do this? I would like a figure for each of the 8 individual tanks in the stack. TBH I'm trying to figure out ...
Abdullah is not an Amalekite's user avatar
2 votes
0 answers
37 views

Does increased thermal emissivity decrease the effectiveness of a solar sail?

I am aware that increased emissivity in solar sails aids with heat reduction, however, I have done some research and found that the emissivity decreases the trajectory of the solar sail through the ...
holly newman's user avatar
1 vote
0 answers
38 views

Interpreting phasing maneuver results using electric propulsion in GMAT

I'm trying to simulate an anomaly phasing maneuver in three different scenarios using electric propulsion in GMAT. The idea is to use the altitude difference (of ~7-8km) between two spacecrafts to ...
Shawn Lim's user avatar
  • 215
3 votes
2 answers
978 views

What is the value of air anisotropy?

I am calculating a jet - gas nozzle and to calculate it, I need to know the anisotropy of the air, what is it equal to? In this formula, the desired value is under the letter ...
DYNAMIC AEROSPACE's user avatar
3 votes
0 answers
65 views

How does a Space-Stabilized Inertial Navigation System actually torque its gimbals?

I've been trying to make a fairly-accurate video (with 3D animations coming soon) about Inertial Navigation Systems (INS), in which I plan to cover all the details from each gyroscopes and ...
Muhammad Kemal Abizar's user avatar
3 votes
3 answers
226 views

Does human sensitivity to radiation impose a maximum distance on interstellar voyages regardless of radiation shielding or speed?

The duration of crewed interstellar voyages is potentially limited by exposure to interstellar radiation. radiation dose obtained in a non-relativistic space module moving in interstellar space would ...
Woody's user avatar
  • 22.9k
3 votes
4 answers
4k views

What's the point of Dream Chaser?

Dream Chaser, a reusable spaceplane launching atop an expendable booster at first, to me at least, seems stupid. There's all the additional development costs, payload penalties, and maintenance ...
Abdullah is not an Amalekite's user avatar

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