That's some great stuff dude. I love thinking about this also. There are actually alot of great sights on this. When I find the one I'm thinking about, I'll post it.
edit:// here it is
http://www.pbs.org/wgbh/nova/elegant/program.html
<--- I suggest you watch that, it's pretty cool.
http://www.pbs.org/wgbh/nova/
The whole pbs.org website is awesome but the nova section deals with maths and sciences and the like.
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				Originally posted by AzCivic  
 
i dont think its possible to go back in time, there'd too much complicated crap as a result of it. 
 
going into the future would be pretty easy though. 
			
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Actually it's the other way around. To some extent there is "some" time travel into the past happening as we speak. Lets say astronaut A goes into space and stays at orbit for a long time. When he went up, him and person B synchronize their watches together. When he finally comes down, person B's watch will be a little bit ahead than person A's. Person B will also have aged a little faster than person A. Pretty cool shit if you ask me.
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				Originally posted by RxGoaT13  
i dont know if other demensions or parallel universe really exist, 
that would mean I would exist in on those other time lines.I mean if i went back in time and killed myself then that means i wouldnt exist in the future to go back and kill myself.hmmm this shit is confusing. 
			
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You would kill yourself and create an alternate universive without you, but your timeline will remain in tact. That's my take on this.