Is Time travel Possible?

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i have no idea at all. i would not elect to time travel if there was a machine that could place me into a far distant time (past or future) because i imagine i may re materialize inside the trunk of a tree or something. what if there was a mountain 12 million years ago where i currently am? i would be stuck inside it and instantly explode.

if i was to materialize in a time which i do not occupy, i would create an explosion of gargantuan proportions. an explosion is a expansion from a small volume to a large volume in a small amount of time. the time taken to expand is a major factor in the severity of the explosion.

if i went from being non existent to the volume i currently am in no time at all in another time. i would be annihilated in such a major explosion that it would rival an antimatter encounter with matter with the antimatter object being 85 kilograms. wow.

^^^
that is far better an answer than i could've imagined. i've never seen anybody else talk about it in that novel way.

That's always bugged me about time travel and teleportation. The idea of a mass instantly arriving in an occupied space without safely displacing it beforehand (even if it's air) would be catastrophic.

hmmm just maybe, that as in how the best sci-fi explanation [so far] of how the heisenberg compensators work in teleportation machines, is "very well, thank you!" - maybe a serviceable sci-fi-styled answer to your question would be that a proportional metering device is implicit in teleporter design, in that you never see teleporting people just blink into existence at the new place but rather they seem to always fade into view. maybe if the writers had the sound fx people add sharp thunder and lightning crackling effects [like in "terminator"] it would add a bit more versimilitude/faux plausibility/truthiness to the picture?

That would be if you emanated from a single point in space. What if each atom appeared in it's proper place and orientation?

Well- if you were planning a trip to the Middle Ages it would be much like jetting to a third world country today. Youd better get your shots!

All those infectious diseases like the plague.

You might be a typhoid Marry yourself - if you went to either the future or the past carrying bugs from our place and time that are endemic and everyone is immune too now that might be lethal pathogens to a future time and place.

Bugtastic!

most sci-fi writers leave out so much important information, they simplify until it is just a fanciful story with no realworld concerns.

it would be the same. each atom of my existence would have to not only "displace" every atom of the volume in which i materialized, it would have to annihilate it.
displacement infers "speed of evacuation", and since i would be instantly there, there could be no "speed" of evacuation of the prior inhabitant of those locii. instantaneous materialization is certainly a calamity if the location of materialization is not vacuous.

you propose that to "grow" from the size of a subatomic particle to 85 liters instantaneously is what i was proposing. (i use "85 liters" to describe my volume because i am 85 kg, and i know i occupy probably less than 85 liters due to the fact that i am heavier than water (but not much)). you agree that that would emit a calamitous shockwave that may be earth shattering (i surmise due to you not challenging that idea).

i did not consider growing from one particle to my size instantaneously in my post. i considered instantaneously materializing as my size.

if as you "re-propose" that i materialize in my entirety instantaneously (which was my original proposition), that it may not be as disastrous, then you should think again. the sum total of material displacement would be the same if i grew from a subatomic particle to my present size instantaneously as it would be if i rematerialized fully and instantaneously.

even if i was made of air, the air where i materialize would not be my air, and it would have to be displaced in zero time which would result in a catastrophic blast for all surrounding observers outward to a large area.

i feel stupid talking to you because you claim you have an IQ of 210 (i read in another thread). if that is the case then why would you even bother questioning me?
you should already have answered the question for yourself. you do not need to ask me.

you seem honest, but i do not really believe your IQ is that high.

Actually, the whole paradox thing goes out the window if you subscribe to the Many-Worlds interpretation of quantum mechanics. If you travel into the past and create a "paradox", you just create an alternate branch without impacting the original one that you came from.

The bigger issue than the paradox thing is how you maintain a constant mass/energy in the universe. You can tuck mass into a pocket of spacetime and "hide it" from the regular flow of time so that you travel into the future. But, you're not actually changing the total mass/energy of the universe (or the specific branch). However, if you try to fling it backwards, you're doubling up on those atoms and charges unless you can somehow just reorganize existing material and build a version of yourself in the past. Of course, that would require information to build that copy which would require the transmission of mass or energy from the future to the past.

Hmmm...unless...Work out the whole quantum teleportation thing and then toss the transmission side towards a nice big gravity well. Yank it out in 1000 years and teleport someone to the receiver (which is now in the past relative to the time dilated transmitter). The information is passed through entanglement and no energy or mass is received from the future {yeah...I don't know how that would work either...but that's the least of the worries}, but the person (and assumedly their conciousness) is duplicated in the past using existing raw materials and energy. No violation of anything other than causality

The more common scenario that I hear proposed is to create a wormhole between two points in normal spacetime and then drag one end of it into a gravity well or move it around at relativistic speeds to create a time differential between the two end points. I suspect that either both endpoints will be be affected or some sort of censorship will kick in to prevent the duplication of mass in the past.

Of course, travelling into the past may simply destroy the universe. It's possible and it's happened, but we're just in a timeline/branch where it didn't occur (obviously, since we're around to have the discussion).

I can travel forwards through time at a constant rate of one second per second.

Hmmm...but do you or is a new copy of you being created with each split of the universe and it just seems like you're moving forward because of the additional information present in each split? (eg: if I make a complete copy of your conciousness and add 5 seconds of new information, there would be no way for you to know if you were the original you that physically moved forward 5 seconds or a new copy with 5 seconds of new experiences).

Even better, does that future you already exist like frames on a spool of film and that sense of "moving forward" is just a weird artifact of information flow in this universe? (and does that backwards censorship mean that time travel into the past simply isn't possible?)

I used to...and it will. But not now...

If we create a universe any time we make a decision, don't that make us all...God?...

I would wonder about going around the sun, faster and faster, wouldn't cintrepital/centrifugal forces kick one into a larger (and less fuel-rich) orbit? I think Kepler had something to say about that.

That second depends on the gravitational or mass constant.

One second to a black hole is near an eternity at Starbucks.

I don't know of any theories that claim time travel is absolutely impossible, but in practice any meaningful amount of time dilation would be quite problematic.

Yes- you would reach escape velocity from the suns Gravity LONG before youd reach even one percent of the speed of light. But thats where your retro rockets come in- to steer you so you stay in that low orbit around the sun. Retro rockets-which ofcourse would take energy- which would siphon off the energy your trying to accumulate to reach the speed of light by orbiting around the sun...