Time is something which fascinates me. You see I don’t believe time actually exists. Yes, we have mechanisms to measure this “thing” very precisely. Almost everything we do is somehow tied to time. Yet there is nothing we can do to change it.
Here is an interesting mental problem. If we could travel faster than the speed of light and we travelled away from the earth while training an infinitely powerful telescope upon it, we would witness events that happened in the past. In a manner of speaking, or thinking, we would be “overtaking the past” or travelling “back in time”.
Now what would happen if we did this for a year, then turned around and raced back toward the earth, still faster than the speed of light? When we turned around wouldn’t we be a year in the past? Or, would a year have passed?