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Comment on Time travel doesn't work unless you also have teleportation. If you travel to the past/future, Earth will be in a different position in its orbit, and you'll die in space.

realitista@lemmy.world ⁨2⁩ ⁨days⁩ ago

Maybe if you timed it juuuuuust right you could land somewhere on the planet as it orbits the sun? I mean I guess it depends on how you determine absolute location in the universe. Is that even possible with the universe constantly expanding?

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massacre@lemmy.world ⁨2⁩ ⁨days⁩ ago
Nope, not possible. The solar system itself is moving as is the galaxy… it’s useful to think of Earth’s orbit as spiraling around the sun in the direction our star is traveling. So 1 orbit later we have not come to the same location.

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- realitista@lemmy.world ⁨2⁩ ⁨days⁩ ago
  But moving relative go what?
  
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  - towerful@programming.dev ⁨2⁩ ⁨days⁩ ago
    Everything else.
    
    Galactocentrism was established in 1925, which realised that our solar system is not near the center of the Milky Way. So, we are moving relative to the center of our galaxy.
    
    In 1929, evidence was found that everything is expanding. So we are moving relative to everything else.
    
    In 1931, the Big Bang theory started superceding Galactocentrism, which was an acentrist model of the universe (where there is no center).
    
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    jj4211@lemmy.world ⁨2⁩ ⁨days⁩ ago
    But what frame of reference?
    
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