this post was submitted on 13 Mar 2025
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This blew my mind. All those movies!
So, Back to the Future's a bunch of bullshit?!
It's possible to assume that the professor did the math.
But yeah any time machine would also basically have to have space travel built in to compensate.
They knew that when they wrote Dr Who (IE the time travel machine is called a TARDIS (Time and Relative Dimension in Space).
Nah, this thing with the planet moving under you is stupid because it assumes a fixed reference frame which is not a thing in our universe. Any movement is always relative to something. You can't just "stay in place". Having the Earth move from under you is very arbitrary.
Yeah, these jokes always assume a jump back in time, not some sort of rewinding for just the traveler.
Even if you assume any frame is valid, you have to pick inertial frames. So even if you travel few days, you will be off from earths orbit into space since earth is in circular motion which is acceletared
There's a ton of issues with time travel. That could be one, but most fictional time-travel devices can be said to accommodate for the difference in distance. It would just be boring to explain on-screen.
floating astronaut with pistol always has been
That's why doctor who works, its very clear about the fact that TARDIS travels in spacetime, it can do only time, only space or both space and time and they can get away with time traveling and still staying on earth
It could be explained as a time and space machine but just saying time machine is easier.
That's how ive always thought of these things in my head.
but imagine if you could set it to the same time but different distance, it would allow you to teleport, that might be too strong.
Sounds like a good tech concept for a story