Physicists Can’t Agree On Whether Or Not Time Is Real

Physicists can’t agree on whether the flow of future to past is real or a mental construct.

DOES ANYBODY REALLY KNOW WHAT TIME IS?

According to our best theories of physics, the universe is a fixed block where time only appears to pass. Yet a number of physicists hope to replace this “block universe” with a physical theory of time.

Einstein once described his friend Michele Besso as “the best sounding board in Europe” for scientific ideas. They attended university together in Zurich; later they were colleagues at the patent office in Bern. When Besso died in the spring of 1955, Einstein — knowing that his own time was also running out — wrote a now-famous letter to Besso’s family. “Now he has departed this strange world a little ahead of me,” Einstein wrote of his friend’s passing. “That signifies nothing. For us believing physicists, the distinction between past, present and future is only a stubbornly persistent illusion.”  Continue reading “Physicists Can’t Agree On Whether Or Not Time Is Real”