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19 Answers

Votes Activity Newest
39
Is there a self-rounding celestial body from which an Olympian could jump into space?
Jan 22 '20 at 19:09
23
Why do many Mars missions launch now, if the Hohmann transfer orbit is the most propellant-saving one?
Jul 25 '20 at 12:35
8
If someone built a vacuum tunnel through the atmosphere, could you have an orbit with a sea level perigee?
Jul 14 '20 at 22:17
6
When our Moon is hiding Mars, is it possible to create a radio communication between Earth and Mars?
Dec 21 '20 at 12:58
6
Delta-v penalty for stopping in a distant Earth orbit versus using atmospheric reentry for braking and returning to Earth from Mars?
Jul 4 '20 at 22:12
6
Why is the bend angle of a hyperbolic trajectory giving different results?
Mar 31 '20 at 0:39
5
Besides hyperbolic flybys, what are all the other cases where the Oberth effect can be used?
Oct 1 '19 at 2:24
5
How will JWST maintain its elliptical orbit around L2?
Jan 11 '19 at 1:18
4
Has a probe ever been lost due to folding its antenna, making it unable to communicate?
Aug 17 '20 at 11:33
4
Calculate flight path angle given semi-major axis, eccentricity and distance from the focal point
May 4 '20 at 20:15
3
How can you determine the nature of an object from its flight path angle, velocity, and radius alone?
Jan 20 '20 at 1:54
3
Given r/a, what are the limits on the direction that an orbiting body could be moving (e.g. solid angle vs r/a)?
Dec 9 '19 at 10:09
3
What information can I get if an elliptical orbit intersecting a circular orbit of radius 𝑟 and velocity of ellipse is equal to velocity of circular?
Nov 11 '19 at 18:16
2
Why is specific impulse equivalent to effective exhaust velocity?
Dec 5 '20 at 22:34
2
Optimal point in LEO to perform interplanetary injection burn
Jul 11 '20 at 22:56
2
How can I find the time of flight between spheres of influence?
Feb 3 '18 at 15:26
1
My vector math seems to be off in this 2D simulation of a solar system
Nov 25 '20 at 14:17
1
Geocentric latitude and longitude of sub-satellite point
Dec 5 '19 at 23:48
1
Finding Earth-Centered Coordinates of Periapsis
Apr 2 '19 at 14:51