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uhoh
  • Member for 6 years, 11 months
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  • Taipei, Earth
127 votes
4 answers
33k views

Do the planets really orbit the Sun?

  • 1,767
114 votes
13 answers
61k views

What are the choices today for orbital mechanics simulation software?

  • 9,986
95 votes
3 answers
137k views

What happens to the Falcon 9 second stage after payload separation?

  • 122k
91 votes
4 answers
16k views

How did Apollo 16 capture this full photograph of the Moon's far side?

  • 119k
76 votes
3 answers
52k views

Was the NOAA-N Prime satellite really dropped on the floor?

  • 17.8k
72 votes
10 answers
54k views

Why is SpaceX considering Methane as fuel for their next engine, the Raptor?

  • 76.9k
62 votes
7 answers
47k views

Why is the breathing atmosphere of the ISS a standard atmosphere (at 1 atm containing nitrogen)?

  • 2,767
57 votes
2 answers
27k views

How does the Falcon 9 first stage avoid burning up on re-entry?

  • 1,649
53 votes
2 answers
18k views

Why is gold used in space technology to protect from heat radiation?

  • 3,248
51 votes
5 answers
5k views

How possible are 'space jumps'?

  • 6,561
51 votes
10 answers
12k views

Game for teaching basics of orbital mechanics

  • 1,146
49 votes
3 answers
7k views

Why did Voyager 2 receive a gravitational slowdown (as opposed to a slingshot) at Neptune?

  • 8,715
48 votes
11 answers
40k views

Could it be possible to launch a rocket from a balloon?

  • 583
45 votes
6 answers
53k views

Can I see the ISS from the surface with the naked eye?

42 votes
3 answers
26k views

Why are the GPS constellation satellites in such a high orbit?

42 votes
4 answers
15k views

Why haven't more spacecraft/satellites been hit by debris?

  • 1,095
41 votes
4 answers
5k views

When the ISS accelerates, do the astronauts feel it?

  • 513
40 votes
1 answer
80k views

How does Voyager 1 send signals to Earth?

  • 18k
39 votes
4 answers
6k views

What uses would the Aldrin-Cycler have?

  • 9,236
37 votes
5 answers
13k views

Is photography from a satellite good enough to make out a person on the ground?

  • 475
37 votes
6 answers
8k views

Why did it take so long for methane to be used as a rocket propellant?

  • 122k
37 votes
1 answer
36k views

Why does the ascent stage of Apollo 11's lunar module look like it's made of paper?

  • 3,950
37 votes
3 answers
9k views

Why should the James Webb Space telescope stay in the unstable L2?

37 votes
4 answers
15k views

Effect of atmospheric drag on rocket launches and benefits of high altitude launch sites

35 votes
3 answers
51k views

How to programmatically calculate orbital elements using position/velocity vectors?

  • 5,924
35 votes
3 answers
23k views

About how long will Curiosity last on its nuclear power?

  • 17.8k
35 votes
3 answers
25k views

When will we have the technology to directly observe an exoplanet with significant clarity?

  • 1,150
34 votes
3 answers
9k views

What does the Sun-Earth-Moon system look like from the Sun-Earth L-2 point?

  • 11.2k
34 votes
4 answers
4k views

Is this really Rosetta's orbit around 67P?

  • 970
34 votes
6 answers
9k views

Why is there a "coasting" phase in some space launches?

  • 13.5k
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