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Dec 6 at 19:43 comment added Gerold Broser In absence of mass geodesics are straight lines, aren't they? The closer to mass the more they are are warped, right? This isn't meant to be a precise mathematical model but an illustration; a good one, IMHO.
Dec 6 at 18:26 comment added Sten The lines are not geodesics in spacetime, because the image does not show spacetime. The lines are not even projected geodesics, because they clearly do not represent the paths that any objects would take under the gravitational influence of the source mass. What are they?
Dec 6 at 18:22 comment added Gerold Broser @Sten Really? It shows an object moving in space while you are watching it in time–spacetime. Is it really not obvious that this lines are geodesics–I also mention this at the beginning–which are warped?
Dec 6 at 17:22 comment added Sten I am not seeing how this animation is useful. It does not show spacetime, just space for some unspecified coordinate choice. I have no idea what the lines or colors represent.
Dec 6 at 10:31 comment added Gerold Broser @Qmechanic I know, but it fits her and there, doesn't it?
Dec 6 at 8:08 comment added Qmechanic Dear Gerold Broser. It is usually frown upon to directly copy-paste identical answers. (The problem is if everybody start to copy-paste identical answers en mass.)
Dec 5 at 23:48 history answered Gerold Broser CC BY-SA 4.0