Colin Sheridan is a writer and columnist. A former officer in the Irish Defence Forces he has extensive deployment experience as a peacekeeper with the United Nations, having lived and worked in the former Yugoslavia, West Africa, Afghanistan, Lebanon and Palestine.
Physicists define time as the progression of events from the past to the present into the future. Basically, if a system is unchanging, it is timeless. Time can be considered to be the fourth dimension of reality, used to describe events in three-dimensional space. It is not something we can see, touch, or taste, but we can measure its passage.
The second law of thermodynamics states that the universe cannot return to exactly the same state in which it was at an earlier point. Time, put simply, cannot move backward.
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