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HopDavid
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178 Answers

Votes Activity Newest
46
How fast will 1g get you there?
Jul 21 '14 at 4:27
41
Why don't we launch spacecraft from the Moon?
Aug 4 '15 at 18:46
24
What's the path of something dropped from a space elevator
Sep 1 '14 at 7:28
23
Gravity Assist braking
Dec 4 '14 at 18:17
22
Why did SpaceX attempt to land the booster on a barge instead of somewhere on land?
Jan 12 '15 at 19:35
22
What's after Pluto for New Horizons?
May 22 '14 at 4:14
21
How long will a 500 km altitude satellite spend in Earth - shade per orbit
Aug 31 '15 at 23:11
20
What is the rarest launch window?
Jul 12 '18 at 22:01
18
Reverse Lunar Space Elevator
Dec 10 '14 at 19:24
15
Is a Moon-base inherently more dangerous than a Space Station?
May 30 '14 at 14:59
15
Could the sun be used as a gravity assist outside the solar system (with current tech)?
Apr 8 '14 at 5:29
14
Is a railgun up Olympus Mons possible?
Feb 3 '15 at 6:21
14
Where could we build a space elevator today (2014)?
May 28 '14 at 20:09
14
Oberth effect for Earth vehicles
Apr 9 '14 at 21:01
13
Did the space shuttle fly straight “up” when leaving Earth?
Mar 31 '15 at 23:24
13
How feasible would it be to move a Kuiper Belt object (a good sized one) into an orbit around Mars?
Mar 23 '15 at 15:12
13
Space Elevator Between Doubly-Tidally Locked Bodies
Aug 18 '14 at 5:54
12
Why have no reusable launch technologies been developed?
Jan 18 '15 at 15:33
12
What are speed limits for free fall, orbital trajectory, and unbound trajectory?
Dec 21 '14 at 19:51
12
If we build a space elevator from Earth surface to GEO, could I step off it at GEO and remain in GEO?
Aug 15 '14 at 18:26
11
Why is L2 Langrangian point stable?
May 3 '20 at 3:50
11
Are there any active or recent projects investigating skyhooks for orbital lift?
Nov 23 '19 at 15:03
11
How unreachable are Jupiter's moons from Mars with the technology developed for going to Mars?
Feb 23 '19 at 20:04
11
Why there is no orbiter for Uranus or Neptune?
Apr 5 '17 at 16:34
10
Are there any major flaws with the Mars Architecture used in the Martian?
Aug 9 '17 at 17:17
10
Is the ideal transfer between two arbitrary planar orbits always a bi-tangential ellipse?
Jul 1 '16 at 17:00
10
How can delta-v and aerobraking as shown in this chart be explained?
Apr 4 '16 at 23:11
10
Would it be more viable to process moon rocks into Helium-3 on the Moon than doing so on Earth?
Feb 2 '16 at 18:51
10
Where will objects end up, after losing stability at Lagrangian points?
Dec 5 '15 at 20:58
10
Does a satellite naturally turn in phase with its orbit, always facing Earth?
Jul 25 '15 at 18:28
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