All Questions
-2
votes
1answer
29 views
What would the effect be if we placed all of our greenhouse gases on Mars?
I don't know how much greenhouse gases are on our planet but what would happen to Mars if we could contain the gases on Earth somehow and transfer it to the surface of Mars?
Ignoring the fact that ...
-2
votes
0answers
20 views
How to solve an equation have tanh() in python [on hold]
I would like to solve an equation like below in python:
tanh(0.05-x)-tanh(0.05+x) = y
If y = 0.1 then how to solve x
0
votes
2answers
50 views
How to calculate the trajectory needed to enter geostationary orbit?
Im building a rocket simulation engine and I would like to try and calculate the components of acceleration required to get the rocket into geostationary orbit. For example, the yellow and green lines ...
4
votes
2answers
1k views
Is getting IN or OUT of orbit easier for the Space Shuttle?
Here is a brief dramatic of the Space Shuttle launch and reentry:
Launch :
You get on this plane like thing that is strapped to an orange fuel tank that looks more like a huge bomb.
The fuel tank is ...
23
votes
2answers
2k views
Is it possible to see animals from space?
Will satellite imagery be able to see the backs of big animals such as lions, tigers, elephants, horses or zebras from space when they venture out in the open? I've not been able to find satellite ...
3
votes
1answer
35 views
Chemical resources on the moon in relation to human occupation
Suppose large settlements are established on the moon with lots of people and industrial activity.
Based on what we know, what chemicals that are needed for human life and industry might be lacking? ...
0
votes
2answers
58 views
Details of Apollo 11 video transmission [duplicate]
NASA has the video of Neil Armstrong on the moon. I'm interesting in the technology how the signal was created and transmitted. There are some details about it in Wikipedia but I'd like to know in-...
3
votes
2answers
112 views
Space Shuttle fuel
As I know, Space Shuttle used the same amount of fuel for every mission. And used OMS for finishing orbit. Then how it is possible that, for example STS-1 which hadn't payload and was in roughly 266km*...
7
votes
0answers
65 views
How many orbits will it take for Santa to deliver all the presents?
This year Santa has decided to try a new strategy to deliver presents which he hopes will require less physics-defying magic, since magic is in short supply these days. Instead of personally flying ...
7
votes
0answers
56 views
How could we make a fair comparison between space rockets regarding their payload mass in low Earth orbit and Earth escaping?
I was searching for comparisons between space rockets regarding their payload mass in low Earth orbit and Earth escaping. First one to see capability of the space booster (the first stages) and second ...
6
votes
0answers
75 views
Unravelling Cassini's “ball of yarn” orbit around Saturn, tabulation of propulsive maneuvers?
The cool GIF on the NASA JPL Cassini resources page All Orbits (2004-2017): The Ball of Yarn is quite beautiful to look at, but it also hints at some beautiful engineering and orbital mechanics as ...
7
votes
0answers
106 views
Understanding formula for geocentric position of Moon
I am trying to understand a basic formula in a Celestial Mechanics reference. The formula is for the position of the Moon in a geocentric frame. The reference claims in line (981) that this should be ...
7
votes
1answer
107 views
Rocket Throttle vs. Jet Throttle
One of the drawbacks of jet engines is that they suffer from turbo lag, whereby a throttle change will take some amount of time to translate to a change in thrust due to the momentum of the turbine ...
7
votes
1answer
95 views
Has solidifying liquid propellant been considered for space exploration?
Liquid hydrogen is $0.071 g/cm^3$
Solid hydrogen is $0.086 g/cm^3$
Since denser fuel is desirable, has solid hydrogen been considered for use in space exploration?
I suspect the very low ...
8
votes
0answers
89 views
How are remove before flight (RBF) pins made?
The CubeSat standard (CubeSat Design Specification Revision 13) requires that CubeSats have a remove before flight (RBF) pin that "shall cut all power to the satellite once it is inserted into the ...
