For myself, because of my life experiences, if there is any doubt that time travel exists and is being used it is for me at least under 1% doubt if that. But do I expect you to believe this as well. No. That wouldn't be right unless you have had experiences like I have had. Each person has to define reality according to their own life experiences.
I was watching "I know What I saw" on the History Channel and began to think about future technology coming back through time and of rich people or military dignitaries or group in the future coming back to tour earth now to see what it was like now and then returning to the future with more information. Because just like now we can't be sure about much of what actually has happened in our history either. Oh, we can be sure of group events and things like battles and maybe the number of deaths in a particular battle, but things like true motivations of leaders and soldiers and average people regarding any number of things is less certain. So often I believe people come back through time to find out what was really going on as much as possible in any given situation because what people write or say about ANY event isn't always true or completely accurate in any way. So, perception is almost always completely different than objective reality. And even then all of our views of reality would change on any given day depending upon what had been happening to us: i.e. did we get enough sleep, food, sex, happiness? Were we healthy or sick mentally or physically that day for any known or unknown reason etc. ? So all these factors especially in world leaders make a big difference regarding almost any outcome in history that particular day for thousands and thousands of years into the past, present and future of Earth. So, for people who just have to know what was really going on, time travel might be for them and just for people who want to see what it was like for their ancestors to be alive now or any other time. So, it is my belief that at a minimum at least half of the UFOs that we see are from our progeny in the future coming back to see their 'Grandparents', their ancestors and what we were all about. And some decide to get to know us.
However, can I explain fully how that affects our time and space? Maybe Yes and Maybe no. If I logically think about it all time and space past, present and future are constantly changing. All we have to do is to look at the premise from particle physics that says, "It is only a probability that any atom or particle is at any specific location at any time."
What that means in real terms is that even though your body or any object isn't likely to appear or disappear at any given moment the same isn't true for small particles and atoms. They seem to come and go at any moment without us having any useful scientific knowledge of where and when they come and go. This is a constant within particle physics. So, if it can be said that "Atoms and particles are constantly on a whim going to other times and spaces and sometimes returning and sometimes not" then it can also therefore be said that time and space are not constants for any matter because parts of that matter are constantly going to other times and spaces all the time. All atoms aren't traveling any given moment but many are. Because of this time is only relative and space is only relative and nothing can be considered a constant but everything is sort of moving and changing more like an ocean of air or water or magma or plasma possibly than anything else I can presently think of. So, all ideas of constants like time are actually illusions. Though it makes humans uncomfortable to think like this maybe some of us need to to actually perceive how things really are in the universe.
