User blog:ProfessorMcG/Time Travel. Is it possible?

I don't think it is possible.

I can imagine two ways of how time travel can either be possible impossible.
 * First, I think it is impossible. I think it won't work because anything that we have changed in the past has already happened in the past. So the history we learn is actually affected by what we did in the past. When we go back we create an effect and that effect was still there until we born and after we were born so the effect we learn about before we leave for the past is the effect that was caused by time travel....is that coherent enough haha? I can't explain things very well.
 * If it is possible in the future, then when we go back in the past and change something that creates a whole new reality (or dimension...it's all just words) and when you travel back to the future you are in your old reality. The reality that was created by your hooligan-ing in the past is a different inaccessable reality.