Every decision that we make, theoretically, causes an endless variety of branches ahead of us in the flow of time. The branch we choose becomes the next segment in our timeline. Each branch that we did not choose becomes a new alternate timeline that moves forward on a different path outside of our own. We are unable to experience the trillions of other alternate timelines, while the single timeline we choose becomes known to us as our history.
Our history is concrete, and, as far as we know, it cannot be changed. It is a single, unbroken timeline that goes all the way back to the point when time began. Our future has yet to be written, and branches off ahead of us like a giant tree of possibilities.
If someone were to travel into the past of our timeline, their actions would, theoretically, create a new timeline that branches off from our own. That person would then either continue to exist within that alternate timeline, or become part of our own already-written history.
If someone were to travel into the future, they would, theoretically, experience a future that might not be experienced by the rest of us. It would be nothing more than one possible future – a random branch derived from things that could happen somewhere in the distant unknown.
There are, however, many people within the Christian faith (myself included), who believe in a God that is all-knowing. That God is the only person who can see the timeline that we have not yet written. He can see this future timeline, because he created time, and he exists outside of it. We, who live within time are not allowed to see our own future, unless God chooses to show it to us. The past is known so that we can learn from it. The future is unknown so that we can rely on the God who is guiding us through it.
To date, there are no known records of time travel, either to the past, or to the future. There could certainly be confidential instances where the time barrier was broken, or someone shifted across timelines, but there is nothing listed within the Federation database. If time travel is possible, it would be an amazing experience, but it would also come with a level of responsibility few people or species would be able to manage.
-Lieutenant Sam Archer
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March 14, 2363 -- (Original Devron Timeline // Devron Timeline w/ Temporal War Reset)
(Devron Timeline 3.0 // Devron Prime Timeline)