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Question

Scientists have speculated on Time travel for a pretty long time,
Can a time machine be created.
Can the present be altered by changing the past
(the scientists have invented the supercollider ,but that only affects particles and cannot aid Humans in time travel)

Answer 1

you cannot travel through time because time is just a manmade concept. it's just a measurement of movement between planets and stars.

Answer 2

Theoretically, if a particle can travel the speed of light then it can bend around space-time, or travel between two points in time. If I am not mistaken I think scientists have accelerated gamma particles at or near the speed of light. So, if a machine was ever created to accelerate particles of greater mass to the speed of light time travel would be possible. The ramfications of time travel at this point are purely speculative, enter all the sci-fi movies and tv show theories.

Answer 3

There was serious speculation in the American Journal of Physics about a time machine by a physicist named Tipler. The math works but the hitch was the physical components... an infinitely long spinning cyllinder of neutron star density.

Considering causality (cause-and-effect), I favor Asimov's sf approach. Changing the past does change the short-term future, but in the same way that placing a rock in a river alters the stream... a little further downstream it flows smoothly back together. I also find merit in the many-worlds interpretation of quantum mechanics... basically everything possible does happen in parallel.

Can we "create" a time machine... well, I like to tinker, so that tells you what I think. ;-)

Answer 4

time travel is not explicitly excluded by the laws of physics and relativity. the problem is the energy requirements are nearly infinite. as far as altering the past there are several thoughts. One is temproal censorhip basically meaning that in order to change the past you must have already gone back and changed the past so in a sense you wouldn't have changed the past. also there's the idea from The Time Machine that if you build a time machine to change the past and you succeed in changing the past then you would never have built the time machine and so you never would have gone back and so you never would have changed the past. and ten points if you followed that on one read through. Then there's the divergent timelines from back to the future 2. change the past and you come back in a different timeline.

Answer 5

- from point of view of science
i see that we must live in reality, invention of time machine is impossible
& i have a simple evidence on that:
all the researches of all scientists has failed in the field of time travelling

- from point of view of our life
if & i say (if) the time machine is invented, then the life will be meaningless & lose its excitement becouse everybody will know his future & if he wanna change anything in his past he will be able to do that change
so there will not be any purpose from life

this is my point of view about time travelling

Answer 6

Well, the theory's there, but that is all it is, theory. I don't think there will ever be time travel...I think it's one of things that people will strive for but in reality is totally impossible.

Can the present be changes by altering the past? Once it's happened, it's happened. There's no changing it.

Answer 7

You can't change the past, but you can change the future. Time travel I think is something that God didn't intend for someone to invent.

Answer 8

Yes even if it was possible if it were ever achieved it would alter everything. Think of what a disaster that might be!

Answer 9

time has no mass for physical science to work on - time travel may be possible but not by moving a physical body to and forth.

Answer 10

Theoretically yes.