One problem with time travel that I’ve never had explained: the earth is not where it was in space an hour ago, let alone many years ago. And we’re not just talking about where it is relative to the sun in its orbit, because the sun and its solar system is moving though space; as is the galaxy.
So to go back or forward in time, one would have to move through space as well, find where you wanted to be and make sure you don’t materialize inside a tree or a wall.
These seem trivial compared to changing the velocity we're moving in time, heheh.
Totally agree. You have to be precise to time AND place when you move forwards and backwards in time. I think long leaps in time will require tremendous amounts of energy due to the distances of, say, the position of the earth now versus it’s position then.
Imagine your time travel machine is a rocket ship floating in space near the earth. You set it to go 1 minute into the past. Now even if you have a really fast rocket ship, it may take you hours or days to get back to where you were 1 minute before. So your sensors won't be in the right place to figure out whether or not the field goal was made so you can place the right bet on the outcome of the game.
In setting Einsteinian time coordinates, one also sets the coordinates for a place, not in Cartesian terms but in relative terms as to significant objects. Thus Einstein referred to space-time as both integral and relative. Or to put it another way, time travel equations are incomplete without also specifying the destination.
Does there not have to be a “fixed point” of reference somewhere in the universe in order to measure time? Else, how does one know they actually returned to where they were in time?
To travel back in time, ... it seems all life processes would operate in reverse, cells decayed - restored, energy previously expended recovered to its original state, etc. Therefore, does not the professor have to prove first that there is no 2nd law of thermodynamics for this to work? Also, I would be interested in how the professor’s mathematical solution addresses the condition of temperature = “absolute zero”.
Other than that, I am going to get another cup of coffee and not try to tax my brain too much this early.
“One problem with time travel that I’ve never had explained: the earth is not where it was in space an hour ago, let alone many years ago. And we’re not just talking about where it is relative to the sun in its orbit, because the sun and its solar system is moving though space; as is the galaxy.
So to go back or forward in time, one would have to move through space as well, find where you wanted to be and make sure you don’t materialize inside a tree or a wall.”
Important safety tip. No wonder my time portal is almost always empty space. Crap. That is another six months of math computations.