uhoh
  • Member for 6 years, 3 months
  • Last seen this week
  • Taipei, Earth
4 answers
124 votes
32k views
38 bookmarks
Do the planets really orbit the Sun?
13 answers
112 votes
58k views
74 bookmarks
What are the choices today for orbital mechanics simulation software?
3 answers
93 votes
134k views
11 bookmarks
What happens to the Falcon 9 second stage after payload separation?
4 answers
91 votes
16k views
13 bookmarks
How did Apollo 16 capture this full photograph of the Moon's far side?
3 answers
76 votes
50k views
12 bookmarks
Was the NOAA-N Prime satellite really dropped on the floor?
10 answers
71 votes
53k views
11 bookmarks
Why is SpaceX considering Methane as fuel for their next engine, the Raptor?
7 answers
59 votes
45k views
10 bookmarks
Why is the breathing atmosphere of the ISS a standard atmosphere (at 1 atm containing nitrogen)?
2 answers
56 votes
26k views
8 bookmarks
How does the Falcon 9 first stage avoid burning up on re-entry?
2 answers
52 votes
17k views
7 bookmarks
Why is gold used in space technology to protect from heat radiation?
10 answers
51 votes
12k views
18 bookmarks
Game for teaching basics of orbital mechanics
5 answers
51 votes
5k views
5 bookmarks
How possible are 'space jumps'?
3 answers
49 votes
7k views
5 bookmarks
Why did Voyager 2 receive a gravitational slowdown (as opposed to a slingshot) at Neptune?
11 answers
48 votes
39k views
16 bookmarks
Could it be possible to launch a rocket from a balloon?
7 answers
45 votes
52k views
11 bookmarks
Can I see the ISS from the surface with the naked eye?
3 answers
42 votes
24k views
10 bookmarks
Why are the GPS constellation satellites in such a high orbit?
5 answers
42 votes
14k views
4 bookmarks
Why haven't more spacecraft/satellites been hit by debris?
4 answers
41 votes
5k views
4 bookmarks
When the ISS accelerates, do the astronauts feel it?
1 answers
40 votes
80k views
11 bookmarks
How does Voyager 1 send signals to Earth?
4 answers
38 votes
6k views
11 bookmarks
What uses would the Aldrin-Cycler have?
5 answers
37 votes
12k views
5 bookmarks
Is photography from a satellite good enough to make out a person on the ground?
1 answers
37 votes
32k views
5 bookmarks
Why does the ascent stage of Apollo 11's lunar module look like it's made of paper?
4 answers
37 votes
15k views
12 bookmarks
Effect of atmospheric drag on rocket launches and benefits of high altitude launch sites
3 answers
36 votes
8k views
3 bookmarks
Why should the James Webb Space telescope stay in the unstable L2?
6 answers
36 votes
8k views
3 bookmarks
Why did it take so long for methane to be used as a rocket propellant?
3 answers
35 votes
22k views
1 bookmarks
About how long will Curiosity last on its nuclear power?
3 answers
34 votes
48k views
38 bookmarks
How to programmatically calculate orbital elements using position/velocity vectors?
3 answers
34 votes
24k views
9 bookmarks
When will we have the technology to directly observe an exoplanet with significant clarity?
4 answers
34 votes
4k views
6 bookmarks
Is this really Rosetta's orbit around 67P?
6 answers
34 votes
8k views
4 bookmarks
Why is there a "coasting" phase in some space launches?
3 answers
33 votes
6k views
4 bookmarks
Why do the exhaust flames from cryogenic stage engines appear to be separated from the nozzle?
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