this post was submitted on 23 Jun 2023
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The earth is always moving through space so most time travellers should just end up falling off the earth and dying in the cold vaccum of space.
If you know enough quantum-relativistic-magical-bullshit to design a time machine, you also know the basic Newtonian mechanics to calculate where the Earth was/will be and how to compensate it.
This is the first time I see this amazing reply to that classic argument. I love it.
Problem: the basic Newtonian mechanics involve the subtle gravitational influence of absolutely everything in the universe, all of which is in constant motion. You can estimate where the Earth was/will be, but not calculate it with anything close to complete certainty.
For all we know, our galaxy was yanked 40 megameters to the left by a black hole passing by its core 26,741 years ago, so your estimate of Earth's position 250 years ago is slightly off…and by “slightly” I mean your time machine deposits you in high Earth orbit. Oops.