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I'm experimenting with how to visualise the geodesics in spacetime under general relativity. Please help with suggestions!

Live demo: https://timhutton.github.io/GravityIsNotAForce/ image

Description: Under general relativity, gravity is not a force - instead it is a distortion of spacetime. Objects in free-fall move along geodesics (straight lines) in spacetime, as seen in the inertial frame of reference on the right. When standing on Earth we experience a frame of reference that is accelerating upwards, causing objects in free-fall to move along parabolas, as seen on the left. More...

Version with more space dimensions: image

Version that is accurate in a varying gravitational field: image

History:

History of the ideas: (please help fill in the gaps!)

TO-DO list:

  • Can we extend to 2+1 with a point mass? Perhaps by considering a single geodesic (e.g. an elliptic orbit) as a straight line and drawing the rest of the universe as a (possibly very strange) distorted grid around that geodesic?