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Michael asked the Naked Scientists:My question is on a time machine which can travel in time but not space.
I wondered about this too. If space-time is interweaved, and time is relative, how about travelling close to the speed of light on the spot (like a treadmill). How would that affect the spacetime in which you are in?
(Big bang theory) Everything in the universe is traveling away from a central point.
Reason 3:(Big bang theory) Everything in the universe is traveling away from a central point. So who is to say the Milky Way would have even been in the same spot 3 years ago?
From the CMB data it is seen that our local group of galaxies (the galactic cluster that includes the Solar System's Milky Way Galaxy) appears to be moving at 627 ± 22 km/s relative to the reference frame of the CMB in the direction of galactic longitude l = 264.4o, b = 48.4o.
How about applying Newton 1 to the problem? If you don't actually provide a Force (impulse) just a 'time impulse', then you would carry on in the same direction at the same speed during your time journey. If you made it a brief 'time hop' you could end up not far from the rest of your original surroundings. It would only be the departure of your straight line trajectory from the curved path of the spinning, orbiting Earth which would cause your destination to be apparently shifted. You wouldn't need to chase your launch spot - just make some corrections. Compared with the other, more basic, problems, this seems a trivial requirement.Or, if the apparent or local time for which you were traveling was vanishingly short, the Earth wouldn't have moved any significant distance in any case. Once you had built the engine, maybe you could finally find out, for certain, about our absolute motion through the ether!
time would stand still and you would cease to exist
Quotetime would stand still and you would cease to existJust to be difficult - for a photon, traveling at c, time slows to zero. That still exists.
I did say I was being difficult.
"to go backwards in time you would first have to come to a stop", this implies that time can be divided into infinitesimal periods.Is this the case is it not quantitsed?.