[quote:52ead]Instead of contracting the space around it, as ordinary matter does, antigravity—or negative energy, as it is sometimes called—pushes it apart. In theory, antigravity would be placed inside a wormhole's throat, opening it wide enough for an astronaut, or possibly even a spaceship, to pass through. Antigravity does the trick; the problem is finding it. Einstein first postulated the existence of antigravity on cosmic scales in 1915, a conjecture proven correct eight decades later. But Einstein's antigravity is wispy and dilute, a spoonful of sugar dissolved in the Pacific Ocean. Opening a wormhole requires a regular torrent of antigravity.
[/quote:52ead]

http://www.popsci.com/popsci/science/ar ... -2,00.html

Try this article too:

http://abcnews.go.com/sections/scitech/ ... 20306.html

Time is made by humans.. it is something artificial created by man,...but if nothing wood change, what is the point in going back...... I tihnk everyone would only go back to the past to change what they have done or what has happened..... but then that would screw up the future... or actually it would be the present. think about it...... ITS A PARADOX GUYS.. there is no real answer.

if i could go ...
Future= Go steal the best Graphis card and Computer ever made then bring it back here

Past=Change the bad choices ive made in life and watch World War 2 fire1:

Were not taking the point, were talking if it is possible. We don't really care about the implications of it. This is all theoretical.

And it's spelt "would" not "wood".

hm...probably the most difficult question.....if you could go back in time.....when?

exceent article:

http://www.howstuffworks.com/time-travel.htm

howstuffworks.com is a great place for all technical answers like this one.

[quote:d40be]According to Einstein's theory of special relativity, time slows as an object approaches the speed of light. This leads many scientists to believe that traveling faster than the speed of light could open up the possibility of time travel to the past as well as to the future. [/quote:d40be]

[quote:0b70d]And it's spelt "would" not "wood".[/quote:0b70d]

no shit

Even if building a time machine were possible it would be most inadvisable to do so.

You never know how your presence could affect what you consider the present, you might even cease to exist.

Think about it, you land in 1917 and squash Adolf Hitler when he was still a corporal, what happens to history after that? No more MOHAA, so we wouldn't be talking about this now, that's for sure.

anyone know the name of the theory that has an example like this...: "if a butterfly in china sneezes, it causes a thunderstorm in Australia"

I just learned this too....

[quote:e3250]According to Einstein's theory of special relativity, time slows as an object approaches the speed of light. This leads many scientists to believe that traveling faster than the speed of light could open up the possibility of time travel to the past as well as to the future. The problem is that the speed of light is believed to be the highest speed at which something can travel, so it is unlikely that we will be able to travel into the past. As an object nears the speed of light, its relativistic mass increases until, at the speed of light, it becomes infinite. Accelerating an infinite mass any faster than that is impossible, or at least it seems to be right now. [/quote:e3250]


Hm, sounds to me that as speed>c, t approaches zero but can never reach zero?

[quote:cd69e]hm...probably the most difficult question.....if you could go back in time.....when? [/quote:cd69e]

1939, Witness the war first-hand.

time travel is impossible guys. if it was then wouldnt u see a bunch of time travelers walking around?

where would you witness it? if you are talking on the battlefield, chances are you would be killed, it's not like you can hover in the air and watch it...the properties of physics would theoretically be equal as they are today

and if you approach c, you cannot slow down? damn...this is very interesting. so far the only logical way to travel at c is by solar currents, at least that is what I know

1939, Witness the war first-hand.[/quote:bcc4a]ugh but how could you go back that far. you werent even born yet ... thus, you dont exist