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Duffman66CMU t1_jdrm8ih wrote

So, here’s the thing about time travel. It’s also got to be time and space travel. Since the universe is rapidly expanding and Earth and the whole solar system are moving, traveling backward in time would likely leave a person in the same exact place, however many years ago. Unfortunately, Earth was not in the same exact place however many years ago.

Ergo, a time traveler could end up inside a star, in freezing cold space, or in the path of a comet or other celestial body. Perhaps that’s why we never hear from them.

I propose a time and space traveling expedition. If anyone has the tech, I have the theory.

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wanszai t1_jdrphjm wrote

Thats why you have to hit 88mph silly. Everyone knows that.

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MonkeysOnMyBottom t1_jdrqt2x wrote

If you time travel at reasonable speeds your momentum and Earth's gravity takes care of most of the space travel part. For instance I just moved forward on minute and had no issues with the earth being millions of miles away. It's like taking an icy curve while driving.

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inquiry100 t1_jduep7r wrote

I actually do know how to build a machine to travel through time and space. Oddly enough, the way it works is totally in accord with generally accepted physics theories even though people often say -- incorrectly -- that time travel is not possible in physics. The basic idea is simple in theory. Build a spacecraft with a particle accelerator for a propulsion system. This can accelerate the spacecraft to a significant percentage of the speed of light. According to relativity theory, this would cause occupants of the spacecraft to experience less passage of time than on Earth. They would, in effect, time travel to the future. This could involve traveling hundreds of years into the future. There are three issues with this. First, it would be very expensive to build because it has to be in space. Second, traveling to the future seems clearly possible, but my idea on how to travel to the past is somewhat more controversial so it might be a one-way trip. Third, I'm not sure relativity theory is actually correct. Nobody will listen to me, but there is an error in the definition of energy used by physicists and it is relevant to the theory of relativity.

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