72
votes
Accepted
Why is my Earth simulation slower than the reality?
In your simulation, the camera (or the viewers perspective) is stationary in what seems like in an altitude of a geostationary orbit. However the ISS is not stationary, it is travelling 7.6 km/s. It ...
- 5,908
58
votes
Can Kerbal Space Program act as a suitable simulator with the right mods?
I helped (somewhat) to develop the RSS/RO/RP-1 mod suite (which, respectively, are and do: Real Solar System, which gives you the Sol system, appropriately sized and massed; Realism Overhaul, which ...
- 10.6k
53
votes
Accepted
Game for teaching basics of orbital mechanics
I want to allow students to tinker around with basic central force motion and see the ways in which conic sections are altered by thrust, etc. Seeing/enacting an example of rendezvous (maybe in a CW ...
- 167k
47
votes
Accepted
Is there a mockup of the ISS on the ground?
There are multiple mock-ups of the ISS, for various purposes:
The Space Vehicle Mockup Facility at Johnston space center contains replicas of many modules of the ISS, some of them assembled together.
...
40
votes
Accepted
Can Kerbal Space Program act as a suitable simulator with the right mods?
For all simulators, the core question is: What is it trying to simulate?
Real world space travel has many different motivations, like for instance:
Science
Military interests
Money
Prestige
...
31
votes
The Martian: Does it really take a supercomputer to calculate spaceflight maneuvers?
Well, developing low-thrust trajectories does take more computation than impulsive trajectories (e.g. like Voyager, which was done with rather primitive computers). You have no choice but to run many ...
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29
votes
Accepted
Is this plot of deep space trajectories correct? Did most launch retrograde from Earth? Why do some change direction between planets?
The diagram you show is the digital version of a drawing by someone with an Etch-a-Sketch: completely inaccurate. The diagram below is accurate, showing Pioneer 10 & 11 and Voyager 1 & 2 ...
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24
votes
Accepted
Who does these mesmerizing simulations of the phases of the Moon? And how?
I made the images on Wikipedia with my own software. The original on Wikipedia is here.
The main work needed is getting the proper position of the Moon with its precessing elliptical orbit, while the ...
- 556
24
votes
Game for teaching basics of orbital mechanics
Personally, I teach orbital mechanics classes to preschoolers, elementary and middle school kids using a makeshift trampoline with stretchable cloth clamped to the rim. Place a heavy weight (e.g. a ...
- 1,994
23
votes
Accepted
If Earth had a second moon, where would it be positioned?
Certainly the Earth could have ended up with additional moons, and Newtonian physics can say some things about the kinds of orbits they might have, but there is a range of possibilities.
First of all, ...
- 10.2k
22
votes
Why is my Earth simulation slower than the reality?
As others have noted, the ISS orbits the earth extraordinarily quickly, and that explains the discrepancy. However, there may still be a small error in your simulation.
Whether or not there is an ...
- 420
21
votes
Accepted
What's is this very CGI looking clip in this NASA video of the Alpha Magnetic Spectrometer installation?
That's generated by one of the Johnson Space Center robotics/EVA planning tools, called MAGIK (Manipulator Analysis-Graphic, Interactive, Kinematic).
Here is a screenshot of a MAGIK video used when we ...
- 178k
20
votes
The Martian: Does it really take a supercomputer to calculate spaceflight maneuvers?
Calculating an energy-optimal orbit for a simple thing like Earth->Mars is no big deal. Even using low-thrust engines doesn't add much to it. It would be tedious but you could do it on a calculator.
...
- 11.5k
16
votes
Accepted
Developing intuition about altitude and velocity in multi stage rockets
I will argue that your simulation outcome is not reasonable.
Consider what happens if we decouple your multi stage rocket right at launch, making no use of the first stage at all. That is, just using ...
15
votes
Accepted
Does anyone know how the Flight Club website simulates Falcon 9 launches?
Flight Club creator here. Thanks for the ping @uhoh ;)
@RussellBorogove got the implementation of the code spot on and it's actually almost exactly what I do. The only points that I feel are worth ...
- 1,073
14
votes
Is there a mathematical formula to calculate drag force without empirical testing?
I am wondering whether there is a mathematical formula that we can use to calculate the drag force without empirical measurements.
Yes, much modern rocket design is done with Computational Fluid ...
- 167k
14
votes
Accepted
Have any bits of a space mission ever collided with a planet or large moon (not Earth) that was not a target of the mission?
Yes
https://scitechdaily.com/space-junk-just-crashed-into-the-far-side-of-the-moon-at-5800-mph/
A piece of space junk (China or spaceX) hit the far side of the moon
- 434
13
votes
Why is my Earth simulation slower than the reality?
The ISS takes approximately 90 minutes to circle the Earth. This presumably results in the higher apparent speed of rotation.
- 178k
12
votes
Getting state vectors from JPL Horizons ephemerides
Keywords: Horizons tutorial
I'll work one example all the way through, and include the exact output you should get so you can check your results.
Then you can change one item at a time to get the rest ...
- 149k
12
votes
Game for teaching basics of orbital mechanics
UC Boulder has a project, PhET, that has many free, interactive, in-browser math and science modules. They have one called Gravity and Orbits that's written in HTML5, making it compatible with most ...
- 382
12
votes
Game for teaching basics of orbital mechanics
Spaceflight Simulator
An Android software, but it's possible to run it on a PC as well.
It's 2d, so it's much simpler to use than 3d software.
There are some premium features ($4 unlocks all of them ...
- 318
12
votes
Accepted
How much of the Shuttle was physically realized in the simulator?
Note: there were a lot of training simulators. This answer concentrates on the Shuttle Mission Simulators. There were mockup type simulators like the Crew Compartment Trainer (CCT) that replicated ...
- 178k
11
votes
Game for teaching basics of orbital mechanics
Probably too basic for what you want but Osmos (https://osmos-game.com/) has modes where the player is basically orbitting an attractor and has to change orbit to rendezvous with other objects in ...
- 211
11
votes
Object slowest at periapsis - despite correct position calculation
If I understand correctly, your $p, q$ are essentially cartesian coordinates, and you're trying to get the velocity components in those two orthogonal directions.
However, you're taking the derivative ...
- 149k
10
votes
Accepted
How might one approach using AI (convolutional neural network) to predict collisions in orbit?
As a data scientist with an interest in space stuff, I am well positioned to give an answer this question. I must confess I don't understand fully what is going on in this system from just the lecture ...
- 6,418
10
votes
Accepted
Why is FORTRAN recommended for astrodynamics rather than MATLAB?
As many of the comments have already mentioned, there are several different reasons people might recommend the use of Fortran over Matlab. One of the most straightforward answers is that a lot of ...
- 663
9
votes
Accepted
What does "masquerading zero gravity" mean?
'masquerading' is a bit of a misnomer. Lying in bed simulates some of the effects that zero gravity has on the body. This article has a decent introduction:
NASA needs more volunteers for its bed-...
- 126k
9
votes
Would current computer technology have made the Moon landings any easier?
In general, the astronauts could operate the spacecraft autonomously without help from mission control. Specifically, you could land on the far side of the moon.
The Apollo spacecraft each had a ...
- 47.7k
9
votes
Accepted
How were Apollo spacesuits cooled during simulations/rehearsals on Earth?
Nearly all Earth training was performed in the A6L model spacesuit (seen in the pictures above). Actual missions flew with the A7L model suit. Differences include:
The outer (EVA) layer of the A6L ...
- 47.7k
9
votes
Was a real Space Shuttle ever used as a really big simulator?
There was a Terminal Countdown Demonstration Test (TCDT) performed late in the training flow for each mission in which the crew would fly out to Florida where their Orbiter was stacked on the pad.
...
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Only top scored, non community-wiki answers of a minimum length are eligible