User GremlinWranger

55 votes

Accepted

Has any space agency saved Earth from a major calamity any time?

answered Apr 24, 2022 at 23:33

50 votes

Accepted

If rocket engines only need fuel and oxidizer, then why there are so many pipe lines on the engines?

answered Jun 20, 2020 at 7:33

49 votes

Accepted

If we can get people to the moon and back, why are we so adamant that it's impossible to service James Webb at 4x that with a one way robotic vehicle?

answered Dec 26, 2021 at 3:52

43 votes

Why is the Falcon Heavy center core recovery done at sea?

answered Oct 20, 2019 at 0:22

42 votes

Accepted

Why were the Apollo 12 astronauts tasked with bringing back part of the Surveyor 3 probe?

answered Oct 11, 2021 at 10:04

40 votes

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Given small computational resources, how was navigation implemented? (Not samples of old guidance software)

answered Oct 14, 2019 at 11:54

39 votes

Why do rockets not glide back?

answered Jan 2, 2019 at 8:22

38 votes

Accepted

Advantages of launching very large rocket while submerged, buoyant, in a body of water

answered Jan 15, 2020 at 9:39

38 votes

If a sitting President went to space on a USSF spacecraft, would the call sign be Space Force One?

answered Feb 2, 2023 at 8:23

37 votes

Could one of the interstellar probes discover Planet IX by accident?

answered Aug 10, 2020 at 12:13

32 votes

Why aren't there any robotic missions on Europa or Enceladus?

answered Jul 25, 2021 at 0:26

31 votes

Before we build a Mars colony, why don't we build a 100% self-sustainable test colony in the Antarctic?

answered Oct 24, 2023 at 11:34

31 votes

Why is it so hard to build a closed-loop ecological life support system?

answered Jan 2 at 13:34

31 votes

Why do nuclear rockets (e.g. NERVA) have such poor Thrust-to-Weight ratios?

answered Jan 2, 2020 at 11:49

28 votes

Accepted

Why did Crew Dragon switch to burst disks instead of multiple check valves?

answered Oct 6, 2019 at 23:43

28 votes

Accepted

What processes create an object with an interstellar velocity?

answered Apr 17, 2022 at 5:29

27 votes

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Docking in space

answered Jan 7, 2022 at 0:04

26 votes

Is it common and good engineering for a pair of cables to be easily plugged into each other's connectors in modern spacecraft

answered Nov 18, 2020 at 11:04

25 votes

Accepted

What is the danger of creating micrometeorite clouds orbiting the Moon by constantly landing spacecrafts on its surface?

answered Nov 24, 2020 at 13:36

24 votes

Was the Space Shuttle ever actually intended for the military to steal satellites without the owner's consent?

answered Mar 2, 2020 at 7:17

23 votes

Why is an airbag landing on the moon not viable?

answered Jul 10, 2018 at 9:14

23 votes

Accepted

Self-sustainable Hermetically Sealed System: Humans & Plants

answered Jul 3, 2021 at 10:31

23 votes

Why will Starship's 150 ton payload capacity be sufficient to carry 100 people to other planets?

answered May 21, 2023 at 7:47

20 votes

Why wasn't robotic arm used to free Spirit rover from sand trap? (and other things...)

answered May 26, 2022 at 14:30

19 votes

Nitrogen trifluoride as a high density oxidiser

answered Sep 20, 2022 at 13:15

19 votes

A way to overcome fuel limits on JWST and its operational lifetime; "clip-on" propulsion systems in development that might work in the future?

answered Jan 3, 2022 at 2:00

19 votes

How was Apollo supposed to rendezvous in the case of a lunar abort?

answered May 28, 2019 at 13:28

19 votes

Accepted

How do we know what percentage of NEOs we've discovered?

answered Feb 20, 2020 at 13:44

19 votes

Does upper atmosphere rotate with earth?

answered Jan 9, 2021 at 5:32

18 votes

Why can't we use the same tank to hold fuel for both the RCS Thrusters and the Main engine for a deep-space mission?

answered Dec 5, 2020 at 6:18

Stack Exchange Network

263 Answers

Has any space agency saved Earth from a major calamity any time?

If rocket engines only need fuel and oxidizer, then why there are so many pipe lines on the engines?

If we can get people to the moon and back, why are we so adamant that it's impossible to service James Webb at 4x that with a one way robotic vehicle?

Why is the Falcon Heavy center core recovery done at sea?

Why were the Apollo 12 astronauts tasked with bringing back part of the Surveyor 3 probe?

Given small computational resources, how was navigation implemented? (Not samples of old guidance software)

Why do rockets not glide back?

Advantages of launching very large rocket while submerged, buoyant, in a body of water

If a sitting President went to space on a USSF spacecraft, would the call sign be Space Force One?

Could one of the interstellar probes discover Planet IX by accident?

Why aren't there any robotic missions on Europa or Enceladus?

Before we build a Mars colony, why don't we build a 100% self-sustainable test colony in the Antarctic?

Why is it so hard to build a closed-loop ecological life support system?

Why do nuclear rockets (e.g. NERVA) have such poor Thrust-to-Weight ratios?

Why did Crew Dragon switch to burst disks instead of multiple check valves?

What processes create an object with an interstellar velocity?

Docking in space

Is it common and good engineering for a pair of cables to be easily plugged into each other's connectors in modern spacecraft

What is the danger of creating micrometeorite clouds orbiting the Moon by constantly landing spacecrafts on its surface?

Was the Space Shuttle ever actually intended for the military to steal satellites without the owner's consent?

Why is an airbag landing on the moon not viable?

Self-sustainable Hermetically Sealed System: Humans & Plants

Why will Starship's 150 ton payload capacity be sufficient to carry 100 people to other planets?

Why wasn't robotic arm used to free Spirit rover from sand trap? (and other things...)

Nitrogen trifluoride as a high density oxidiser

A way to overcome fuel limits on JWST and its operational lifetime; "clip-on" propulsion systems in development that might work in the future?

How was Apollo supposed to rendezvous in the case of a lunar abort?

How do we know what percentage of NEOs we've discovered?

Does upper atmosphere rotate with earth?

Why can't we use the same tank to hold fuel for both the RCS Thrusters and the Main engine for a deep-space mission?