Ok, but only the simple version for now. A more in depth discussion may be for another forum.
At the instant of the Big Bang the arrow of time was decided...forward. The laws of physics or constants of the Universe were established. Everything that is in existence came to be as a result of these constants and the flow and "direction" of time. To reverse this direction would require the reversal of everything (entropy). You cannot remove any form of matter or energy from the Universe to allow that bit of information (man or radio wave) to travel in the opposite direction (conservation).
We are all time travelers. Traveling forward in time along with the entire Universe at the defined rate we call seconds, minutes, days, weeks, months, years, etc. We can imagine going back in time or looking into the future and I do enjoy a good time travel story but in reality I will just sit back and enjoy the ride.