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(PhysOrg.com) -- By observing the way that light moves inside a metamaterial, researchers have reconstructed how spacetime has expanded since the Big Bang. The results provide a better understanding of why time moves in only one direction, and also suggest that time travel is impossible.
Originally posted by treespeaker
Didn't Eintstien Theories say going forward isn't possible but going backward may be?
Or he might have been speaking on the recording devices we have now as I have always thought.