jonesy
A Wicked Kendragon
Well, arrow of time is basically the question of whether cause and effect only travel in one direction. Assuming that time could be reversed (this is just as a thought experiment, not as an actual assumption that it could be), if you shoot an arrow towards a target and then reverse time, could the energy unleashed in the arrows passage re-enter the arrow and send it back to the bow? In other words, could cause become the effect and effect the cause in a time reversed scenario? If there is even a slight difference then time has a definite direction that can be measured. The problem is that some processes are reversible and symmetric, and some are not. Quantum physics seem to operate on different laws than macro physics.