All Questions
19,080
questions
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4
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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?...
- 527
-5
votes
1
answer
27
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.
1
vote
0
answers
28
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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 ...
- 11
0
votes
0
answers
102
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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 ...
- 29
2
votes
0
answers
87
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?
- 479
3
votes
0
answers
44
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 ...
- 3,093
0
votes
1
answer
73
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, ...
3
votes
1
answer
109
views
Why does an expendable Starship launch cost only $100 million?
Even the Falcon Heavy with a third the payload costs $150 million. And yet we have Payload Research saying that an expendable Starship launch costs less?
5
votes
3
answers
2k
views
Reducing required length of a mass driver using loop?
If you had a loop of electromagnets with an encapsulated payload inside vacuum tubes, how fast could you accelerate the capsule to before it reached some maximum velocity?
What effect would scale have ...
4
votes
0
answers
50
views
GMAT Lambert problem
I would like to plan a mission in GMAT to a certain asteroid, whose orbit and SPK file I have added in GMAT. However, I don't know how to solve the Lambert problem in it to first find the intersection ...
5
votes
1
answer
159
views
What does Paul Birch mean by kg * s^-1 * kg^-1?
In Paul Birch's paper, Terraforming Venus Quickly he mentions a unit kg * s^-1 * kg^-1, which I interpreted as ($\frac{kg}{kg \cdot s} = \frac{1}{s}$). This is a valid unit, representing a rate. ...
- 5,884
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 ...
- 297
4
votes
3
answers
101
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 ...
8
votes
1
answer
519
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 ...
- 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 ...
- 1,138