We don't know precisely, but we can make estimates based on the expansion and shifts in the universe. This isn't necessary however, since we can still make calculations based on our movement over time.

Another interesting thing is that atoms may also be expanding. Not only could someone end up in the wrong place, but they may also be larger or smaller (assuming the atoms didn't resize based on the time/location).

We don't know precisely, but we can make estimates based on the expansion and shifts in the universe. This isn't necessary however, since we can still make calculations based on our movement over time.

Another interesting thing is that atoms may also be expanding. Not only could someone end up in the wrong place, but they may also be larger or smaller (assuming the atoms didn't resize based on the time/location).

It would be nice if you could elaborate on this. I thought the big bang occured everywhere and space expanded? How could it have an origin point relative to us? Do you mean the natural vector our matter just happened to get pulled and tossed because of other matter around it at the beginning of the universe, compounded over time? Stars move, clusters and galaxies move, galaxy clusters and superclusters move. But if even IF the big bang had an origin point relative to us (assuming it doesn't wrap at the edges) that could be pinpointed, we have no idea where it is, or even if it's in our current cosmic horizon.

It would be nice if you could elaborate on this. I thought the big bang occured everywhere and space expanded? How could it have an origin point relative to us? Do you mean the natural vector our matter just happened to get pulled and tossed because of other matter around it at the beginning of the universe, compounded over time? Stars move, clusters and galaxies move, galaxy clusters and superclusters move. But if even IF the big bang had an origin point relative to us (assuming it doesn't wrap at the edges) that could be pinpointed, we have no idea where it is, right?

If you accept that we're on the edge of the future and no events have happened beyond our present moment, the answer to “why hasn't anyone seen a time traveler?” is simple: Humans, even other species, haven't invented it yet.

If you believe future events have already taken place and time travel has already been invented in the future, the answer is also simple (albeit frightening): The human species won't survive to experience time travel.

If you leave Earth at it's fastest orbital speed (rounded down to 58315kts), and appeared in future Earth at it's slowest orbital speed (rounded down to 56,935kts), your new airspeed will be 1380kts… right before the plane rips apart and you wish you made a parachute from an old sheet. Reversing that scenario, you would be flying backwards at that speed… err, I mean breaking up at that speed.

You mentioned teleportation, in theory it's possible with quantum entanglement, but that's only in the current space-time. The problem it brings up is even if you could make the second quantum state go through time, how do you know where to place your next quantum state without going there first? You would risk *teletimetravelporting* into a kite some jerk is flying, last time I checked, a kite wasn't healthy to embed in your spine. So, the point of that is you would definitely want to time travel in space where your chances of embedding matter into yourself are far less, which means you need a spacecraft… and even then, there's no guarantee that you will not embed yourself into a defunct Filipino satellite (yes, in 1000 years they may have a space program).