all my life.. one second at a time.
I was always taught energy can neither be created nor destroyed. So if you put a photon in the past or future does that mean a photon from that time must simultaneously appear at the moment the other one time travelled? By that same logic.. if it were possible to send a human to another time, would the same amount of energy appear at the exact moment of the send?
Another question is if time travel were ever possible in the future would we not already see humans or is it that the future does not exist yet so only past time travel is possible? All of it gets very confusing. Personally, I don't think it will ever be possible.