Time Travel

Do you think Time Travel is possible?

I'm torn b/c I love sci fi where it is part of the story. Then I start thinking about time travel & if you go back & change the thing that makes you go back then, do you ever go back & if you don't doesn't the original thing happen? And if you can't change the past then why does everyone think they can. And if you accidently leave someone in the future and go back to the present and change things so the future is different what happens to them? Are they trapped in an alternate reality or does reality just change for them so they are all "what is going on? Yesterday I was in jail and now I'm at the zoo...."

And, if it is possible, do you think people are time traveling right now? Maybe not from our time but from the future. Maybe, if there is over population people travel back in time & live now. Only that wouldn't help the overpopulation problem in the future. Anyway, if there is time travel & over population they can set up a colony on the moon or in space somewhere. If we can time travel we better be able to space travel.

I want to go into space. SPACE!!!