The inspiration for their theory isn't just an explanation for the Big Bang our Universe experienced 13.7 billion years ago, but lies in an attempt to explain one of the largest mysteries in physics - why time seems to move in one direction. The laws that govern physics on a microscopic scale are completely reversible, and yet, "no one gets confused about which is yesterday and which is tomorrow". Physicists have long blamed this one-way movement, known as the "arrow of time" on a physical rule known as the second law of thermodynamics, which insists that systems move over time from order to disorder. ... The second law cannot be escaped, but Professor Carroll pointed out that it depends on a major assumption - that the Universe began its life in an ordered state. ... A natural explanation for this discrepancy would be if it represented a structure inherited from our universe's parent.
philosophy space time physics universe cosmology Big Bang