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Why would you time travel to a position relative to anything other than the earth?
This. It would have to be set as relative to something, why you would define that as any object not Earth or on Earth is a mystery to me
Ooh, new science fiction idea. We built a time machine and can only use it to reach other star systems. But just those that have been or will be at the same "spot" as earth.
With the reference point being a black hole at the center of the milky way from which it derives all it's power, love it: get a draft to my desk before July 19th and we'll talk potential remuneration.
If you use the CMB for reference you should be able to reach other galaxies.
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