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71 Answers

Votes Activity Newest
46
How hard is it to receive direct signals from vehicles on the surface of Mars, and has anyone other than the DSN done so?
Feb 27 at 16:02
41
Curiosity and Perseverance landing - with so much dust blown everywhere, what's the point of the skycrane?
Feb 28 at 11:02
37
How did the Perseverance rover land on Mars with the retro rockets apparently stopped?
Feb 24 at 16:10
36
How many petaflops does it take to land on the moon? What does Artemis need with an Aitken?
Aug 26 '19 at 16:41
35
Is it possible for a moon to have a higher surface gravity than the planet it is attached to?
Dec 2 '19 at 19:20
25
Would it have been cheaper and/or faster to put a James Webb-like Space Telescope on a balloon instead of a rocket?
Jul 26 '20 at 13:52
23
Can our civilization colonize solar system while reliant on fossil fuels?
Jun 19 '20 at 11:04
21
Double redundancy for the Saturn V LVDC computer memory, how were disagreements resolved?
Aug 11 '19 at 10:59
20
Why did Curiosity not have a camera on board to record the landing?
Mar 3 at 9:31
16
What is a “fee area” exactly and why is it named that way?
Sep 24 '20 at 13:05
16
If someone built a vacuum tunnel through the atmosphere, could you have an orbit with a sea level perigee?
Jul 15 '20 at 14:04
14
How did skeptics of rocketry think rockets work?
Aug 9 '19 at 14:52
12
Could a steam engine work on the moon?
Jul 26 '20 at 18:47
11
Which operating system is Perseverance running?
Aug 2 '20 at 13:11
10
Ingenuity Test Stand and Stroboscopic lightning
Feb 26 at 10:51
9
Why does the Deep Space Atomic Clock have such a short mission?
Jul 21 '20 at 18:55
9
SpaceX Body Flaps - Why so Much Power Required
Jun 21 '20 at 11:46
8
Why Ingenuity drone has 2 coaxial rotors, not quad-rotor
Feb 20 at 14:28
8
Is there a mathematical formula to calculate drag force without empirical testing?
Sep 17 '20 at 18:39
8
Number of segment in Wing leading Edges
Jul 24 '20 at 14:29
8
What is the atmospheric composition of Venus at the 34 mile (50 km) altitude of the proposed HAVOC program?
Jan 13 '20 at 14:07
8
Is an Earth synchronous (?) polar orbit possible?
Jan 10 '20 at 12:44
8
What kind of camera was used to produce this Apollo-era footage of the Earth?
Jul 29 '19 at 10:37
7
Can you estimate the diameter of the marked small craters of Mars in the firsts HiRes pictures released by China?
2 days ago
7
Why does the Perseverance Rover do sample caching?
Feb 22 at 12:17
7
How fast is fuel escaping a rocket for it to reach the escape velocity 11 km/s?
Oct 13 '20 at 10:27
7
Why did the Apollo lunar suits have two visors?
Jul 5 '20 at 11:51
7
Could the James Webb Space Telescope detect chlorophyll on a exoplanet?
Jan 8 '20 at 10:01
6
If Starship works, how much would it cost to create a system of rotable space mirrors that reduces temperatures on earth by 1° C?
Sep 15 '20 at 15:25
6
Could a helium balloon on Mars and on Triton float at air pressures lower than it could on Earth due to the bodies' low gravities?
Jun 18 '20 at 13:56
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