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15 Questions

Views Newest Activity Votes

17

60

votes

8

answers

33k

views

Why would SpaceX not use parachutes for the final descent of the first stage?

spacex falcon-9 reuse first-stage

Aug 25 '16 at 1:37 Community♦ 1

15

33

votes

2

answers

46k

views

What computer and software is used by the Falcon 9?

spacex falcon-9 software flight-computer

Feb 7 '18 at 2:00 HM Joseph 1

4

29

votes

1

answer

6k

views

If I drop a feather from orbit, would it burn up or “hit” the ground?

reentry physics

Jun 16 '15 at 5:07 Mark Adler 53.2k

4

28

votes

4

answers

7k

views

Why does the Falcon 9 have 9 engines?

launch spacex falcon-9 design first-stage

Oct 1 '16 at 5:46 Adrian Midgley 1

2

22

votes

4

answers

4k

views

Why did Voyager 2's velocity drop far below escape velocity before the first gravity assist?

gravity voyager delta-v escape-velocity

Oct 25 at 19:03 Steven Sands 1

4

20

votes

7

answers

15k

views

How stable would a Falcon 9 first stage be after it has landed on a drone ship?

spacex falcon-9 reuse falcon9-r first-stage

Jul 19 '16 at 1:05 Community♦ 1

2

18

votes

1

answer

5k

views

Why does SpaceX appear to get less funding from NASA for the same thing as competitors?

spacex nasa commercial cost

Mar 19 '16 at 16:16 Adam F 103

2

10

votes

3

answers

2k

views

Could SpaceX start testing to return the Falcon 9 first stage to land instead of water?

spacex landing reuse falcon9-r first-stage

Dec 29 '15 at 23:57 Community♦ 1

9

votes

2

answers

1k

views

How much of the space debris around Earth is man-made?

debris

Jun 3 '15 at 16:05 Organic Marble 97.2k

3

9

votes

1

answer

2k

views

What is the performance of ion thrusters in actual deployed spacecraft?

propulsion advanced-propulsion ion-thruster

Feb 11 '15 at 22:24 Russell Borogove 116k

8

votes

2

answers

1k

views

Would it not be easier for SpaceX to make their first stage only partly reusable?

spacex falcon-9 reuse first-stage

Jan 9 '15 at 14:29 AlanSE 14.9k

6

votes

2

answers

1k

views

Why does SpaceX not use the Crew Dragon for CRS missions to test it?

spacex dragon dragon-v2

May 28 '15 at 12:40 Community♦ 1

6

votes

1

answer

1k

views

What auxiliary engines do the Falcon 9 first stage have?

spacex falcon-9 engines falcon9-r attitude

Mar 3 '15 at 12:46 geoffc 65.2k

1

5

votes

1

answer

1k

views

Most common causes of 21st century launch failures and how often do launches fail?

launch spacex failure reliability

Mar 2 '15 at 16:00 geoffc 65.2k

4

votes

1

answer

300

views

What are the actual economics for the ULA reusability plan?

reuse economics booster ula vulcan

May 18 '15 at 19:19 LocalFluff 23.9k

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