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Top Questions
40 votes

Why do they have a Snellen eye chart on the ISS?

iss crewed-spaceflight health medical ocular asked Jan 31 '16 at 22:49
space.stackexchange.com

40 votes

Is there a working law of gravity in 2D?

reality-check physics gravity alternate-reality 2d asked Mar 3 '16 at 14:01
worldbuilding.stackexchange.com

32 votes

Do any aircraft carry boats?

cargo seaplane asked Sep 8 '19 at 16:14
aviation.stackexchange.com

26 votes

Can I just stack the Earth?

reality-check alternate-worlds megastructures asked Feb 5 '16 at 9:52
worldbuilding.stackexchange.com

24 votes

Why do the contents of the Space Shuttle External Tank not match the mixture ratio of the engines?

space-shuttle fuel asked Oct 14 at 12:26
space.stackexchange.com

21 votes

Why did the Apollo Lunar Module have four landing legs?

apollo-program landing lunar-landing landing-gear asked Jan 13 '16 at 14:34
space.stackexchange.com

20 votes

Was the third shuttle engine any different from the others?

launch space-shuttle engine-design ssme asked Jan 25 '16 at 7:09
space.stackexchange.com

19 votes

Is the ideal transfer between two arbitrary planar orbits always a bi-tangential ellipse?

orbital-mechanics orbital-maneuver delta-v bi-tangential-transfer asked Jul 1 '16 at 16:00
space.stackexchange.com

17 votes

What is the optimal inclination change strategy?

orbital-mechanics mathematics delta-v inclination-change asked Aug 15 '19 at 12:44
space.stackexchange.com

15 votes

What target is the most difficult to reach in the solar system?

orbital-mechanics mission-design solar-system asked Sep 14 '19 at 17:00
space.stackexchange.com

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Top Answers
101
What is the closest distance a human being has come to Mars ever since the beginning of the space age?
space.stackexchange.com

98
How to survive the heat death of the universe?
worldbuilding.stackexchange.com

81
Why would an underwater creature remain lodged to its prey?
worldbuilding.stackexchange.com

81
Are there any “Third Order” acronyms used in space exploration?
space.stackexchange.com

81
Building a bridge to the stars
worldbuilding.stackexchange.com

71
Could we wait for Mars to come to us?
space.stackexchange.com

58
What scientifically would make it possible that certain large bodies of water be impassable?
worldbuilding.stackexchange.com

56
Does it require less energy to reach the Sun from Pluto's orbit than from Earth's orbit?
space.stackexchange.com

51
Can a moon orbit its planet faster than its planet rotates?
space.stackexchange.com

44
Is there a mockup of the ISS on the ground?
space.stackexchange.com

41
What crimes have been committed or attempted in space?
space.stackexchange.com

40
Why aren't there any active space debris removal systems implemented currently?
space.stackexchange.com

37
Can Kerbal Space Program act as a suitable simulator with the right mods?
space.stackexchange.com

33
Can you really use Arduino for a small spacecraft?
space.stackexchange.com

31
Land a cubesat on the moon with ion engine
space.stackexchange.com

30
Golfball Dimples on spaceships (and planes)?
space.stackexchange.com

27
What is the name of the area on Earth which can be observed from a satellite?
space.stackexchange.com

27
How to force a country to use a language that merges two languages that diverged 1000 years ago?
worldbuilding.stackexchange.com

27
How are the Mars Rovers maintained?
space.stackexchange.com

26
Why does a spacecraft have angular velocity relative to Earth?
space.stackexchange.com

26
How much bigger could Earth be, before rockets wouldn't work?
space.stackexchange.com

26
How could a hot lander enter Titan's atmosphere without setting its hydrocarbons ablaze?
space.stackexchange.com

26
Case invert your quine
codegolf.stackexchange.com

24
Pheromone-based language
worldbuilding.stackexchange.com

24
Did Feynman cite a fallacy about only circles having the same width in all directions as a reason for the Challenger disaster?
space.stackexchange.com

24
What is the practical use of passing a Turing test?
worldbuilding.stackexchange.com

23
Are there any saltwater rivers on Earth?
earthscience.stackexchange.com

22
Is there a puzzle that is only solvable by assuming there is a unique solution?
puzzling.stackexchange.com

20
How does gravity really work
astronomy.stackexchange.com

20
Why do many RTGs have finned heatsinks, when this is considered bad for radiation heat transfer?
space.stackexchange.com

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