| General > General Technical Chat |
| SciFi movies and pathetic misconceptions of tech failing for the story line. |
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| David Hess:
--- Quote from: AndyBeez on April 19, 2023, 02:26:40 pm ---Why do time machines always hold station? That is, they always arrive at exactly the same geodetic location in the past, present and future. Never the true motion of the earth's rotation, orbit, transit and the associated perturbations are taken into consideration. Not even tectonic and erosional elements either. --- End quote --- Niven's time machines had to be anchored to their start point in order to return to their origin. Heinlein's time machines implicitly could travel in space also. Forward's time machines were wormholes with endpoints that could be moved but were otherwise fixed in space and time, and also because of the physics involving negative mass, could be used as reaction-less drives. Also, throw out conservation of mass and energy. Check out Larry Niven's The Theory and Practice of Time Travel. |
| coppice:
--- Quote from: David Hess on April 19, 2023, 05:18:01 pm --- --- Quote from: AndyBeez on April 19, 2023, 02:26:40 pm ---Why do time machines always hold station? That is, they always arrive at exactly the same geodetic location in the past, present and future. Never the true motion of the earth's rotation, orbit, transit and the associated perturbations are taken into consideration. Not even tectonic and erosional elements either. --- End quote --- Niven's time machines had to be anchored to their start point in order to return to their origin. Heinlein's time machines implicitly could travel in space also. Forward's time machines were wormholes with endpoints that could be moved, and also because of the physics involving negative mass, could be used as reaction-less drives. --- End quote --- Most of the fictional time machines which are combined space and time machines still have the issue that their velocity is magically right after the hop, and they are, say, sitting nicely on the surface of some target planet. If they also deal with matching the velocity of the target they are rendezvousing with, there would need to be a massive energy exchange (and without further technical means, some serious G forces), as typically a large hop through space would put you among things travelling at an enormous velocity relative to where you came from. |
| mendip_discovery:
Some just make time go faster while you sit still. So they can happily stay in the same place as they move with the earth. |
| tggzzz:
Larry Niven had fun with his JumpShift teleportation machines, e.g. if you teleport from the equator to a pole, or change altitude, the kinetic and potential energy has to come/go too. That was also the first time I came across CamelCase typography for names. It is common now, but I think Niven might have invented it. |
| AndyBeez:
I suppose a time machine remains geo-effective because it makes a kind of temporal vacuole in the space time continuum? Well that's how I'm explaining all of that Star Trek, go find a Humpback Whale in the 1980s, garbage. Another thought regarding time travel, what about the microbes riding shotgun with the traveller? A time traveller from 1989 << "Excellent" >> arriving today to pick up their sure bet copy of Greys Sports Almanac 2022, might transport the Covid Arcturus variant back to the valley - causing the timeline to skew into an alternate tangent; resulting in Donald "Biff" Trump not becoming US President. When travellers from Europe arrived in the new world carrying influenza, syphilis and smallpox, their pathogens decimated the indigenous populations. So what diseases from the future might cause issues for the ethical time tourist? |
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