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42 votes
3 answers
10k views

Have we attempted to experimentally confirm gravitational time dilation?

38 votes
1 answer
39k views

What is a "suicide burn"?

33 votes
5 answers
6k views

If we build a space elevator from Earth surface to GEO, could I step off it at GEO and remain in GEO?

32 votes
7 answers
14k views

How could a 90 m/s delta-v be enough to commit the space shuttle to landing?

25 votes
1 answer
5k views

Was the Apollo 13 CM guidance computer fully shut down?

22 votes
2 answers
5k views

What is the marginal cost of *landing* on the Moon?

22 votes
2 answers
3k views

Did Sputnik 1 have attitude control?

20 votes
2 answers
2k views

Could a single crew member fly the Apollo LM?

17 votes
1 answer
3k views

Is there any merit to the Apollo 13 (movie) statement "a computer that can hold millions of pieces of information"?

17 votes
1 answer
2k views

What makes time on the DSN so expensive?

16 votes
2 answers
3k views

In the Saturn V launch sequence, what defined COMMIT, and what happened between COMMIT and LIFTOFF?

12 votes
3 answers
2k views

How precise are our Mars landings?

10 votes
1 answer
1k views

Are there seasons on Luna?

10 votes
1 answer
924 views

To what extent did Apollo payload mass drive Saturn capability?

9 votes
1 answer
596 views

How much extraneous mass did each of the Apollo missions carry?

9 votes
2 answers
3k views

What is the effect of gravity slingshots around Earth on Earth's rotation and orbit time, and is this effect worth considering?

9 votes
1 answer
1k views

Why has the Earth's motion carried it out of view of Pioneer 11's antenna?

8 votes
1 answer
2k views

Could the Apollo LM abort mode be engaged after touchdown? What would have happened if it was?

7 votes
2 answers
2k views

Which STS mission raised the normal engine throttle above 100%, and what change to the SSME made that possible?

6 votes
3 answers
339 views

How was radio telescope observation data transferred before wide availability of high-speed Internet?

5 votes
3 answers
929 views

What is the typical relative impact velocity of orbital debris in low Earth orbit?

5 votes
4 answers
497 views

Do transfer orbits toward the central star necessarily result in a higher velocity on arrival due to the star's gravity?

4 votes
1 answer
480 views

What scientific and technological advances were prompted directly by Sputnik 1?

4 votes
0 answers
288 views

From where is this sequence in the Apollo 13 (movie) extra material showing Gene Kranz?

4 votes
1 answer
2k views

Is it correct to say that a LH2/LOX rocket uses water as propellant?

3 votes
1 answer
213 views

Which current (2016) ISS resupply vehicles are human-rated, and how many astronauts can they each support?

2 votes
4 answers
1k views

Is powered descent from orbit a viable method of reentry on bodies with an atmosphere?