Today I want to talk about time travel.

Wells, Heinlein and many others have stories dealing with time travel: however, untill recently respectable physicists have regarded time travel as a fantacy. However new quantum gravity studies have given some credence to this wild idea.In fact there are theoretical physicists who have been writing about time travel in the pages of 'Physical Review' recently.

Time travel has been considered impossible, Newton beleived that time was like an arrow only went forward in a straight line. However Einstine said time was more like a river speeding up and slowing down as it passed around massive bodies, and time was relative. Kurt Goedel (one of the greatest mathematical logicians) came up with solutins to Einstine's equations that allowed for time travel. So how do we instigate time travel? There have been theories that we could use black holes (worm holes) to travel great distances in time and space however it has been thought that anything entering a black hole would be crushed. Wellllll.... not so fast, in 1963 Roy Kerr (another mathamatician) found a solution to Einstines equations that indicated a black hole would not colapse to a point but into a spinning ring of neutrons. This would act as a portal through the black hole kind of like Alice and the looking glass. The portal would not only conect regions of space but of time as well.

What about all the paradoxes? Could you go back in time and change your past, current and future? Would you be able to kill your own parents, keep them from meeting etc? In quantum theory we can have multiple states of any object. An electron can exsist simultaneously in different orbits (this is responsible for giving us the laws of chemistry). So applying quantum theory to time travel we are merely creating another reality and are changing someone elses past. In order for us to benifit (or suffer) from changes made we would need to stay in that reality and not return to our own.

Stephen Hawking once opposed the idea of time travel; however within the last 5 years or so theoretical physicists have made a lot of progress and Hawking has changed his mind and now believes that time travel is possible but not practical or probable. So dont plan on jumping into your Delorian and rushing back in time to buy stock in Disney.

Again this is all theoretical and is pretty far feched. Scientists belive the energy requirments to acomplish this would require a type III civilization and currently we are a type 0 however I will save that topic for another day. I personaly think these people have way to much time on their hands, but it is kinda interesting to read and think aobut. (Now I need to go take a couple of asprin this is making my head hurt) ;]