A Physicist Has Discovered Math That Makes 'Paradox-Free' Time Travel Plausible

Re:A Physicist Has Discovered Math That Makes 'Paradox-Free'... by russellbeattie on Sunday September 27, 2020 @12:06AM (#24604153)

Good thoughts. Your first problem also need to address your position in space itself. The Earth and solar system are travelling at 230 km/s in reference to the galactic center. Going back in time 100 years would plop you well out in interstellar space if you didn't account for your universal location as well.

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Re:A Physicist Has Discovered Math That Makes 'Paradox-Free'... by mcswell on Sunday September 27, 2020 @12:30AM (#24604232)

I think the problem is worse than this. There is no universal coordinate system, no 0x0x0 coordinate to measure everything from. The Earth is moving wrt the galactic center, the galactic center is moving wrt...what? The Andromeda galaxy? Why should that galaxy be special? And the local cluster is moving wrt...what? All the other galaxy clusters, I suppose, but what does that mean?

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Re:A Physicist Has Discovered Math That Makes 'Paradox-Free'... by sktguha on Sunday September 27, 2020 @03:03AM (#24604815)

indeed . so the galaxy cluster might have moved by a really massive distance, assuming even if there is some universal coordinate system

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