Orbits around Schwarzschild Black Holes

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The gravitational pull of a black hole is so strong that it will warp a two-body orbit away from anything elliptical. In this Demonstration, modifying the angular momentum, initial radius, time, or view shows the effects of extreme gravitation.
Contributed by: David Saroff (March 2011)
Open content licensed under CC BY-NC-SA
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Thanks to Professor Harold Zapolsky of Rutgers University at whose office blackboard I first sketched black hole orbits.
Permanent Citation
"Orbits around Schwarzschild Black Holes"
http://demonstrations.wolfram.com/OrbitsAroundSchwarzschildBlackHoles/
Wolfram Demonstrations Project
Published: March 7 2011