Time travel issues

[Nomesb69]

Ok so say I discovered a means to physically manipulate time. And also for this example say there was a person that was killed in a plane crash in 2005. It is now the year 2010 so for five years this person has been deceased and is living their after life currently as well as the last 5 years. So I enage my time device in 2010 and go back to the day before then plane crash and some how convinced this person not to get on the plane. The individual listens and does not get on the plane and there for does not die in the crash. This means he would now be alive in the year 2010 and has been alive all this time. However what about his spirit time he spent dead before the timeline was changed? Is that erased? Is he now compelled back into his physical existence against his spiritual will? I know people have theorized before on different time lines in the physical but when the physical stops the spiritual begins. What if this spirit while dead reincarnated during the 5 years he was suposed to be dead before I went back and changed the events that lead to his death. He would have to be alive in the new time line physically and his physical body needs his spirit but how could his spirit encompass two body's?

[Xanth]

There are a few trains of thought on a theory such as that...

First, what's done is done... you might be able to go back and change it, but then you have a time line that splits off from what's considered YOUR time line.  So when you get back, all you've done is allowed this individual to live in a different time line, but in yours, they're still dead.
Another thought would be that you've now changed history... and your current has to align to that new history. This would probably happen automatically.  What if in allowing that person to live, in some future date, they accidentally killed someone close to you?  Car accident?  Something...

Suffice to say... I wouldn't touch ideas like this, because it probably won't end well for someone. 

I believe that a big part of life is making choices, and figuring out how to live with the repercussions of those choices.

[NoY]

If he dident die in the crash why would you go back in time to save him? 

:NoY:

[Stookie]

Oooohhh, good thinkin NoY...

[interception]

How to make a time portal:
1. Make a nice little stable wormhole.
2. Place one end of the hole in earth orbit.
3. Take the other end of the wormhole on your shiny spaceship on a journey through space.
(You have to travel close to the speed of light so a large time variance can develop between the two ends of the wormhole.)
4. Bring the other end back to earth.

Tada, you have a working time portal thingy!

I think bad things will happen if matter or information tries to actually travel (or in any way interact) in the direction of a wormhole with a negative time variance though. Very bad things.

Theoretically though, you will end up with a non interactive  view screen into the actual past.

This is off course assuming wormholes can be made stable enough to begin with.