What Keeps Time Moving Forward? Blame It on the Big Bang
Posted by keelynet on February 15, 2010
But whereas we spend our days passing freely through space in any direction we wish (gravity and solid obstacles permitting), time pushes us along, willingly or not, in a single predetermined direction: toward the future. This is the arrow of time—life carries us from the past, through the present, and into the future.
Back to the Future plotlines notwithstanding, no one knows how to reverse the arrow—how to move backward in time—and the logical paradoxes that would result from such a trip into the past render it a thorny proposition at best. Entropy, which in rough terms is the measure of a system’s disorder, creeps up over time, as dictated by the second law of thermodynamics.
To illustrate entropy’s inexorable growth, Carroll takes us to the breakfast table—you can’t unscramble an egg, he points out, and you can’t unstir the milk out of your coffee. These systems invariably proceed to disordered, or high-entropy, arrangements.
But why should entropy always increase? This is where Carroll turns to cosmology, which must explain why the universe began in a uniquely low-entropy state.” – Full Article Source
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