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59 votes

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What "actually" happens at T-minus-0

answered Nov 30, 2016 at 16:10

49 votes

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

answered Aug 23, 2016 at 13:57

30 votes

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

answered Dec 3, 2013 at 8:44

23 votes

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

answered Sep 29, 2014 at 8:14

22 votes

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

answered May 18, 2016 at 20:30

19 votes

How far would the STS get without the SRBs

answered Jan 6, 2017 at 22:40

17 votes

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

answered Apr 20, 2016 at 15:30

16 votes

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

answered Nov 14, 2014 at 9:09

12 votes

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

answered Dec 19, 2014 at 21:02

12 votes

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

answered Oct 31, 2016 at 8:53

6 votes

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

answered Nov 24, 2016 at 8:44

6 votes

How long can Philae stay "alive"?

answered Nov 13, 2014 at 12:17

5 votes

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

answered Jun 5, 2014 at 20:10

5 votes

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

answered Jan 8, 2016 at 12:11

4 votes

Transfer between elliptical orbits

answered Jan 21, 2016 at 14:51

4 votes

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

answered Aug 26, 2014 at 11:37

4 votes

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

answered Jun 16, 2017 at 19:11

0 votes

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

answered Dec 19, 2014 at 10:29

Stack Exchange Network

18 Answers

What "actually" happens at T-minus-0

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

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

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

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

How far would the STS get without the SRBs

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

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

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

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

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

How long can Philae stay "alive"?

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

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

Transfer between elliptical orbits

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

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

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