User Russell Borogove

52 votes

1 answer

7k views

Did a Soyuz fly with a Union Jack?

asked Sep 26, 2018 at 3:04

49 votes

1 answer

4k views

Why is there a Saturn V in the background of this Gemini-Titan launch?

apollo-program identify-this-object saturn-v project-gemini

asked Mar 28, 2020 at 15:34

32 votes

3 answers

8k views

Has in-space refueling been done?

apollo-program propulsion docking rendezvous refueling

asked Jul 22, 2015 at 15:48

29 votes

5 answers

3k views

Why no parachutes in the Orion AA2 abort test?

testing abort orion-spacecraft recovery parachute

asked Jul 2, 2019 at 18:25

27 votes

2 answers

3k views

Were cosmonauts equipped with poison pills?

astronauts eva

asked Aug 11, 2017 at 0:17

25 votes

1 answer

5k views

What makes the Merlin vacuum engine so deeply throttleable?

spacex falcon-9 engines

asked Nov 29, 2015 at 18:38

23 votes

2 answers

6k views

How intrusive was the Apollo Master Alarm system?

apollo-program lunar-landing safety

asked Nov 8, 2015 at 19:03

22 votes

3 answers

4k views

How does SpaceX plan to achieve reusability of the Falcon 9 second stage?

falcon-9 reuse asds merlin-1d kestrel

asked Jul 31, 2015 at 4:25

20 votes

1 answer

1k views

What does burnt Aerozine-50/N2O4 smell like?

the-moon apollo-program lunar-landing chemistry

asked Jul 28, 2015 at 21:16

20 votes

1 answer

2k views

Why were Delta II SRBs asymmetrically mounted?

launch rockets history solid-fuel

asked Feb 9, 2015 at 21:27

20 votes

2 answers

3k views

Could an Apollo LM land uncrewed?

apollo-program lunar-landing uncrewed-spaceflight

asked May 24, 2017 at 15:17

20 votes

1 answer

404 views

Were any Apollo-13-specific procedures added to standard training?

apollo-program apollo-13 training

asked Apr 16, 2020 at 22:03

18 votes

1 answer

2k views

What's falling off the Shenzhou/Long March stack?

launch long-march shenzhou

asked Oct 16, 2016 at 23:59

18 votes

5 answers

2k views

Is atmospheric skimming for propellant feasible?

fuel atmosphere oxygen hydrogen fuel-depots

asked Jan 13, 2017 at 15:56

18 votes

2 answers

19k views

Why is TEA-TEB chemical ignition used instead of spark ignition?

fuel engines hydrogen restartable-engine kerosene

asked May 25, 2016 at 4:43

17 votes

2 answers

2k views

How fast does Roche limit disintegration proceed?

orbital-mechanics planetary-science tides

asked Jul 21, 2015 at 16:20

16 votes

4 answers

2k views

Sputnik: What took so long?

history sputnik

asked Sep 5, 2014 at 14:54

16 votes

1 answer

1k views

Cause of apparent plume deflection on SES-10?

launch spacex rockets falcon-9

asked Apr 1, 2017 at 1:52

16 votes

2 answers

2k views

Apollo altitude vs rate-of-descent schedule

apollo-program lunar-landing lunar-module

asked Jan 16, 2020 at 5:21

15 votes

1 answer

710 views

Historically, how risky are first launches of new rockets?

failure safety historical-data

asked Feb 6, 2018 at 17:45

15 votes

1 answer

907 views

How did Goddard's rocket reach 41 feet altitude in under 2.5 seconds?

rockets simulation

asked Aug 21, 2014 at 14:18

14 votes

1 answer

1k views

What was the first time a "re-used booster" was used to put a payload into orbit?

falcon-9 space-shuttle reuse spaceflight-firsts srb

asked Mar 29, 2017 at 14:11

13 votes

1 answer

870 views

What were the differences on the LM ascent stage engines on Apollo 9, 10, and 11?

apollo-program lunar-landing

asked Feb 23, 2016 at 22:49

12 votes

1 answer

1k views

How is rocket engine cutoff controlled?

launch low-earth-orbit stages flight-profile

asked Jan 19, 2015 at 21:48

12 votes

1 answer

2k views

Has USSR/Russia launched humans on any rocket not derived from R-7?

crewed-spaceflight soyuz-spacecraft russia soyuz-launcher vostok-program

asked Aug 6, 2019 at 2:01

12 votes

2 answers

1k views

Are any of these Soyuz controls involved in separating the orbital module?

spacecraft soyuz-spacecraft russia

asked Aug 30, 2018 at 21:20

10 votes

1 answer

712 views

What's a "delog"?

apollo-program apollo-13 mission-control

asked Apr 14, 2020 at 3:44

10 votes

3 answers

903 views

How reliable are pressure fed hypergolic engines?

engines hypergolics reliability pressure-fed-engine

asked Jan 19, 2017 at 22:13

9 votes

1 answer

619 views

What does "angle of attack 100%" mean in Apollo abort rules?

apollo-program saturn-v abort

asked Jun 22, 2018 at 3:31

9 votes

1 answer

361 views

Did Huygens take a picture of Cassini?

cassini camera

asked Sep 15, 2017 at 21:08

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54 Questions

Did a Soyuz fly with a Union Jack?

Why is there a Saturn V in the background of this Gemini-Titan launch?

Has in-space refueling been done?

Why no parachutes in the Orion AA2 abort test?

Were cosmonauts equipped with poison pills?

What makes the Merlin vacuum engine so deeply throttleable?

How intrusive was the Apollo Master Alarm system?

How does SpaceX plan to achieve reusability of the Falcon 9 second stage?

What does burnt Aerozine-50/N2O4 smell like?

Why were Delta II SRBs asymmetrically mounted?

Could an Apollo LM land uncrewed?

Were any Apollo-13-specific procedures added to standard training?

What's falling off the Shenzhou/Long March stack?

Is atmospheric skimming for propellant feasible?

Why is TEA-TEB chemical ignition used instead of spark ignition?

How fast does Roche limit disintegration proceed?

Sputnik: What took so long?

Cause of apparent plume deflection on SES-10?

Apollo altitude vs rate-of-descent schedule

Historically, how risky are first launches of new rockets?

How did Goddard's rocket reach 41 feet altitude in under 2.5 seconds?

What was the first time a "re-used booster" was used to put a payload into orbit?

What were the differences on the LM ascent stage engines on Apollo 9, 10, and 11?

How is rocket engine cutoff controlled?

Has USSR/Russia launched humans on any rocket not derived from R-7?

Are any of these Soyuz controls involved in separating the orbital module?

What's a "delog"?

How reliable are pressure fed hypergolic engines?

What does "angle of attack 100%" mean in Apollo abort rules?

Did Huygens take a picture of Cassini?