Through The Wormhole S2E3: Is Time Really Real? | Morgan Freeman Explores the Mystery ⏳

Einstein discovered that time is relative while Isaac Newton had thought of time as absolute. Time runs faster for astronauts than people on Earth; people on Earth experience time more slowly because they are closer to the gravitational field of the massive Earth.

Studies have shown that for many people time can feel like it goes by faster as we age.[19]

In ancient Greece, Parmenides contended that motion is impossible. Likewise, it was argued that time is an illusion. Julian Barbour claims that the Wheeler–DeWitt equation supports his idea that time doesn't exist! The Wheeler–DeWitt equation doesn't depend on time. Contrarians contend that the Wheeler–DeWitt equation shows that one can't reconcile general relativity with quantum mechanics and that time is real.

The Fermi Space Telescope will measure if the speed of a photon of light from 13 billion years ago is different from the speed of light now.

Steve Weinstein posits that time may have more than one dimension although time is traditionally treated as a scalar quantity; the majority of physicists see time as a quantity with one dimension, though.

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