I have an interesting theory on time travel. I'm not sure if a scientist has already come up with this, but this is a theory that makes time travelling a little bit more plausible (though there could be flaws, as most theories go).

Imagine that the world's first time machine has been built, and as a test, their first act of historical alteration is to let's say prevent JFK's assassination. So the scientists go back to the past to stop the event from happening, but do they really go back to the past?

The activation of the time travel apparatus creates a cosmic disturbance which splits the galaxy into two, creating two duplicate galaxies (just like how an amoeba would split). The scientists end up in the clone dimension unaware of what has happened, where they successfully prevent JFK's death yet their actions are not felt in our present world because their action have occurred in the duplicate universe.

So they go back to their previous time, however this creates another disturbance that leads to the creation of another duplicate dimension, based on the one they just came from (now slightly altered post-1963). They return to their time, where they celebrate the fruits of their labor. Many people now begin time travelling on a regular basis, unaware of the fact that they can never go back to their "original" dimension.

Back in our dimension, the scientists never came back home, after months of investigations surrounding their disappearance, they were declared dead by the government citing a possible freak accident involving the apparatus that literally wiped out all signs of their existence. Time travel has been rendered impossible to perform. Back in dimension 3, many families are still waiting for their loved ones to come back from their "history trips" while a class-action lawsuit against the people behind the time travel technology is brewing.

So what I'm trying to say is that it is possible to witness history unfold and alter the course of events, only big consequence is we can never really go back home, since we just jump forward into the clone dimensions of our own makings.

For a while, I'll be tentatively calling this the "Infinity Jump" theory until I could come up with a slightly interesting name.

Any queries?