Going into the past is impossible. You can travel into the future by abusing t= t'/√(1-v2/c2) time is passing more slowly for the person travelling at such a speed than it is for the observer.
So you need to build something that can transport a person as close to the speed of light as possible, and return them safely to where they started. The closer to the speed of light that you travel the shorter the trip and the further into the future you go.
Travelling at the speed of light for 50 years for example is not easy to accomplish. It'll seem like a very short amount of time has passed for you, but how are you going to safely move something for 50 years at that speed? And without killing them? You'd have to gradually reach that speed somewhere out in space, not hit any space debris, and return to earth.
What if the vessel could spin in place at a high speed?
Could it orbit the earth while corkscrew spinning at Mach 42069?
Even if that worked how in the heck would you survive it
Isnt this back to front. You'd want to go slower than everyone else?
So you just jump off earth and stop rotating on the axis and stop orbiting the sun. And when the earth came around again, you'd be in the future?
Or you could just take a nap.
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