all 5 comments

[–]wizzwizz4 2 insightful - 1 funny2 insightful - 0 funny3 insightful - 1 funny -  (4 children)

Is there any evidence of this? Because honestly, if any nation state had managed to suppress that much scientific advancement they'd be ruling the solar system right now.

[–]Mnemonic[S] 1 insightful - 1 funny1 insightful - 0 funny2 insightful - 1 funny -  (3 children)

I filled it under 'Alternate History' for a reason.

Made me think about Red Alert 1, 2 and 3.

Also, since 'time' is't a thing and is called space-time usually, means to go back in 'time' you'ls need to have the power and reach to change the whole of existence and showhow filter the 'time-traveling stuff' out.

[–]wizzwizz4 2 insightful - 1 funny2 insightful - 0 funny3 insightful - 1 funny -  (2 children)

No; all you'll need is a way of generating a closed time-like curve that encompasses regions of spacetime outside your light cone. As far as we know, that's physically impossible, but it might be possible if a certain part of our physics is proven wrong.

[–]Mnemonic[S] 1 insightful - 1 funny1 insightful - 0 funny2 insightful - 1 funny -  (1 child)

If you do that, you'll end up somewhere outside our solar system, It just makes sure you end up in the same space-time coordinates only a different 'time'. The earth moves, our solar system moves and the milky way moves.

And how fast is the Milky Way Galaxy moving? The speed turns out to be an astounding 1.3 million miles per hour (2.1 million km/hr)!

https://astrosociety.org/edu/publications/tnl/71/howfast.html

[–]wizzwizz4 2 insightful - 1 funny2 insightful - 0 funny3 insightful - 1 funny -  (0 children)

There is no absolute reference frame. If you had a magical machine that created closed time-like curves long enough to encompass decades, you would:

  1. Not want to do that anywhere near Earth, if you wanted us to survive the process.
  2. Probably be able to choose where the other end is.
  3. Probably not be able to change the past anyway; it depends on how physics turns out to work.