by John Deakins
We live in an Einsteinian universe. Newton’s laws also work pretty well. Time Travel requires a Ptolemaic, geocentric universe, of which this ain’t one.
If you travel in Time from a particular spatial location, you should emerge in that same location: Right? As the Earth rotates, Chicago is rolling eastward at 1600 km/hr. In the next second, your position will separate from your original by over 400 meters. Five minutes in Time is over 130 kilometers in space. The spinning Earth just won’t hold still!
Unless you repeal Conservation of Momentum, when you arrive with a twelve clock-hours difference than the time of day you left, you’ll exit onto an Earth in which everything on the rotational counter-side will be slamming into you at 3200 km/hr.
Just make sure that you travel exactly multiples of one day. Chicago will have rotated to the same spot . . . except that the Earth is revolving around the Sun at 30 km/sec more. Five minutes is almost 9000 km away. Even a quick jaunt leaves you breathing vacuum.
Don’t forget the Sun’s orbit around the Milky Way’s core (Add hundreds of km/hr more.) and the motion of the galaxy relative to the space-time continuum. Unless your time machine is also a sealed space craft, you won’t survive to appreciate just how much airless space the universe contains.
What about reentry? When you reach a new space-time locus, will you simply push the air aside as you expand from an infinitesimally small point? That would produce a whopper of a thunderclap. Arriving secretly would be impossible. If your machine were too flimsy, the rebounding shock wave would crush it.
Will you and the local molecules simply become one? Writers agree that arriving inside a solid, regardless of method, would be a poor survival idea. With untold trillions of molecules present, some of yours would arrive inside other molecules. You might blow up like a balloon, or simply blow up. If your atomic nuclei appeared in the same space as local atomic nuclei, and the strong nuclear force would fuse them, with fatal radiation and energy release. Nuclei that were close, but not close enough, would be repelled at particle-collider speeds. You’d create thousands of fast particles that would shred your cells like a radioactive shotgun blast.
We don’t want to give up Time Travel, but what can be done? You can always Ignore It. Your readers are also geocentric. They won’t notice that you can’t travel from now-Chicago to then-Chicago without cheating on the universe’s rules. Have fun.
That’s a solution? We’re Science fiction purists. There has to be a better way. More next time.
John Deakins, B.A., M.S.T. is a four-decade veteran of the science classroom and author of his own fantasy series Barrow.
To read an excerpt from Barrow book one, please click HERE.
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