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58 votes
Accepted

What "actually" happens at T-minus-0

49 votes
Accepted

Why does the SpaceX Falcon 9 rocket do a 180 flip for reentry?

31 votes
Accepted

What is the farthest a spacecraft has traveled away from earth?

24 votes
Accepted

Why don't we use catapults to get to space?

22 votes

What would be the (most difficult) challenge to make a 10,000 year satellite?

19 votes

How far would the STS get without the SRBs

17 votes

Does communications with spacecraft red shift the further away they are?

16 votes

Why is there no POV video of the Philae lander landing?

12 votes

Do electronics and mechanical components work in a vacuum or require a sealed controlled atmosphere?

11 votes
Accepted

Could an Apollo astronaut have put their foot through the hull of the LEM?

6 votes

What would be a few challenges to build a landing strip on mars?

5 votes

Do any current ICBM's have the delta-V to target the sun?

5 votes

How long can Philae stay "alive"?

5 votes

Couldn't I escape Earth's gravity traveling only 1 mph (0.45 m/s)?

4 votes

Is there a simple relation between delta-v and travel time?

4 votes
Accepted

Radio Link Design of a low power, sensors to satellite communication system

2 votes

Transfer between elliptical orbits

0 votes

Could upper stages take down space debris as a 2nd mission?