Comment on When somebody backs up their argument with a 90-minute video
chonglibloodsport@lemmy.world 3 hours agoThat’s special relativity. General relativity is the theory of the curvature of spacetime as the mechanism for gravity. Large masses curve spacetime more than small masses. Under GR, gravity is not a force.
sukhmel@programming.dev 3 hours ago
Good point but why “no bowling ball on a trampoline nonsense”? That’s not a correct analogy, since it deforms “space” different from how gravity transforms space, but it’s good enough to understand how that works, I think
chonglibloodsport@lemmy.world 3 hours ago
Oh because that incorrect analogy is the most common “lay person” analogy for describing gravitational curvature of spacetime. The most common reply from children is that it’s the earth’s gravity pulling down on the bowling ball so that the trampoline demonstration wouldn’t work in space.
Also the trampoline analogy doesn’t show us how gravitational lensing works, nor does it even touch how different gravitational reference frames affect the passage of time (GR generalizes special relativity, after all).