User kim holder

59 votes

7 answers

5k views

How do we know the Apollo Moon landings are real?

asked Jun 28, 2018 at 20:07

58 votes

7 answers

58k views

Who coined the phrase 'Rapid Unscheduled Disassembly'?

rockets history terminology rud

asked Jul 18, 2015 at 17:35

28 votes

7 answers

5k views

Could liquid airlocks work?

the-moon colonization habitat airlock

asked Aug 25, 2015 at 0:28

24 votes

2 answers

4k views

Suppose Zuma wasn't "lost" — what would it take to detect it?

tracking security classified detection zuma

asked Jan 15, 2018 at 18:40

22 votes

2 answers

3k views

Why does SpaceX have a launch window for a pad abort test?

launch spacex spacecraft-development dragon testing

asked Apr 22, 2015 at 1:43

21 votes

7 answers

12k views

Can ion thrusters be scaled up?

propulsion engine-design ion-thruster

asked Mar 30, 2015 at 2:17

21 votes

3 answers

3k views

How hard is it on the crew to go through the 14+ g's of a launchpad abort of the Soyuz, or the Falcon system?

health failure abort launch-escape-system g-force

asked Feb 14, 2015 at 17:52

20 votes

2 answers

3k views

How fast could a person run on the Moon?

the-moon colonization gravity physical-activity

asked Dec 31, 2014 at 2:18

20 votes

3 answers

4k views

What would a lunar eclipse look like from the surface of the moon?

the-moon

asked Oct 8, 2014 at 14:43

20 votes

3 answers

2k views

How does the Saturn V Dynamic Test Stand work?

space-shuttle engineering saturn-v testing

asked Aug 19, 2019 at 1:37

19 votes

2 answers

2k views

How many astronauts have had spiritual experiences while in space?

astronauts health psychology

asked Sep 28, 2015 at 1:00

18 votes

4 answers

6k views

Why is NASA planning to deorbit the ISS instead of reusing its newer modules, like the Russians will?

iss mission-design end-of-life

asked Mar 21, 2015 at 18:12

17 votes

1 answer

936 views

What are the challenges of turning a rocket stage around and firing its engines into a supersonic wind?

launch spacex reuse propulsive-deceleration

asked Oct 26, 2014 at 2:35

17 votes

1 answer

14k views

Why is the Russian approach to the aerodynamics of their rockets different?

rockets engine-design russia atmospheric-drag booster

asked Jan 31, 2015 at 22:44

17 votes

2 answers

4k views

How feasible is it to use aluminum and liquid oxygen as future propellant sourced from the moon?

the-moon colonization mining fuel isru

asked Nov 14, 2014 at 18:11

16 votes

1 answer

3k views

How weak can a propellant be and still get a rocket to space, theoretically?

launch rockets fuel

asked Apr 11, 2015 at 3:21

16 votes

1 answer

562 views

Is radiation dose from cosmic rays higher behind 50 cm of shielding, or lower?

radiation cosmic-radiation 3d-modeling

asked Mar 29, 2017 at 18:27

15 votes

1 answer

828 views

Does having only 3 people on the ISS create workload problems?

iss astronauts risk-management

asked Oct 3, 2016 at 15:32

15 votes

1 answer

2k views

How does the launch risk for a plutonium RTG and a uranium fission reactor compare?

launch safety nuclear rtg

asked Jun 7, 2016 at 15:48

15 votes

2 answers

1k views

If we could send an orbiter to the Pluto-Charon system, could we put it in a stable orbit?

orbital-mechanics probe pluto

asked Mar 9, 2016 at 23:33

15 votes

1 answer

2k views

What does it mean for a launcher to be 'nuclear-certified'?

launch nuclear safety launch-vehicle regulatory

asked Jul 27, 2016 at 15:48

15 votes

2 answers

2k views

What aspects of reentry heating 'scale as the 8th power'?

reentry interplanetary

asked Feb 7, 2018 at 0:49

15 votes

1 answer

3k views

What NASA documents did SpaceX use to design their engines?

spacex nasa engine-design

asked Feb 21, 2015 at 16:14

14 votes

4 answers

577 views

Why is private spaceflight suddenly expanding so quickly?

launch commercial

asked Feb 7, 2015 at 21:53

14 votes

4 answers

7k views

How many photographs are there of the whole Earth?

photography earth-observation

asked Dec 2, 2014 at 16:20

14 votes

4 answers

3k views

What about gathering water ice from Saturn's rings?

water mining saturn rings ice

asked Oct 3, 2014 at 16:55

14 votes

1 answer

6k views

What happens to the Soyuz boosters that land in the Kazakhstan desert?

booster recovery soyuz-launcher

asked Jan 31, 2015 at 22:07

14 votes

3 answers

1k views

If an unknown ship entered Earth orbit, would it be detected?

observation

asked Mar 7, 2015 at 2:10

14 votes

3 answers

6k views

How does an astronaut pack for the ISS?

iss astronaut-lifestyle psychology

asked May 15, 2015 at 21:36

13 votes

1 answer

2k views

How accurate are modern ephemerides, and how does their accuracy degrade over time?

orbit trajectory ephemeris calculation prediction

asked Oct 30, 2014 at 18:19

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122 Questions

How do we know the Apollo Moon landings are real?

Who coined the phrase 'Rapid Unscheduled Disassembly'?

Could liquid airlocks work?

Suppose Zuma wasn't "lost" — what would it take to detect it?

Why does SpaceX have a launch window for a pad abort test?

Can ion thrusters be scaled up?

How hard is it on the crew to go through the 14+ g's of a launchpad abort of the Soyuz, or the Falcon system?

How fast could a person run on the Moon?

What would a lunar eclipse look like from the surface of the moon?

How does the Saturn V Dynamic Test Stand work?

How many astronauts have had spiritual experiences while in space?

Why is NASA planning to deorbit the ISS instead of reusing its newer modules, like the Russians will?

What are the challenges of turning a rocket stage around and firing its engines into a supersonic wind?

Why is the Russian approach to the aerodynamics of their rockets different?

How feasible is it to use aluminum and liquid oxygen as future propellant sourced from the moon?

How weak can a propellant be and still get a rocket to space, theoretically?

Is radiation dose from cosmic rays higher behind 50 cm of shielding, or lower?

Does having only 3 people on the ISS create workload problems?

How does the launch risk for a plutonium RTG and a uranium fission reactor compare?

If we could send an orbiter to the Pluto-Charon system, could we put it in a stable orbit?

What does it mean for a launcher to be 'nuclear-certified'?

What aspects of reentry heating 'scale as the 8th power'?

What NASA documents did SpaceX use to design their engines?

Why is private spaceflight suddenly expanding so quickly?

How many photographs are there of the whole Earth?

What about gathering water ice from Saturn's rings?

What happens to the Soyuz boosters that land in the Kazakhstan desert?

If an unknown ship entered Earth orbit, would it be detected?

How does an astronaut pack for the ISS?

How accurate are modern ephemerides, and how does their accuracy degrade over time?