What is a wormhole?
It's a hypothetical tunnel through space-time that unlike a black hole, has two openings instead of one. Kip Thorne committed a couple chapters to them in his book "Black holes and time warps". Most likely they would collapse instantly if created, so maintaining them would require the existence of something speculatively called "exotic mater". Unlike normal matter, it would have negative mass and therefore negative gravity. This would prevent a singularity from forming and also allow the geometry of space-time to be manipulated based on the arrangement of matter and exotic matter. The amount of energy needed for this, however, would probably exceed anything our sun could produce in its lifetime. Hypothetically, however, you could connect two points in space-time using this, allowing someone to travel through both time and space. This is the only theory I knew that time-travel may be possible. But it's hard to get in the wormhole. Only the speed of light can make it out.

Time travel has been proven to exist. Except it's only been forward in time, because backwards would create a paradox. I don't know to much about the theory of wormholes, because there isn't much to know about it :/

you cant travel forwards in time as it hasnt been written yet but backwards time is possible BUT you wouldnt be able to touch anything noteven a peice of grass if you kill a blade of grass 100mi yrs ago saddam hussein could be the united states dictator or japan and germany wouldve won the war

Time travel to the future is possible, and has been done already, in space.  

Of course time travel to the future is possible, we are all travelling forwards in time right now. They key is to increase the speed of the flow of time, which can be done by going at the speed of light. Time is relative to the speed at which you are travelling.

I have built a machine in my mind which allws me to slow my perception of the passage of time but its just a personal experience everybody else's time is unaffected.

i told nazir of doing that a while ago! then it means you control your time dilatation which is naturally triggered by panic moments when decisions should be done quickly. do you remember nazir? mark that is something awesome, how much do you change time? like 5 real seconds for us are "x number" of seconds for you in that state

A little, yeah. I believe in time travel. But I wanted to discuss more about these wormholes here and how they work.

i have concluded if you travel to a planet on the farthest side of the universe@ age 18 going exactly at light speed and you travel back to the earth as soon as you get to point A once you get back to earth every one you know will be dead your mind will only be 25 years old but your body would be around 100-150 as you would have been traveling for 150 years