Is time an illusion?
Great Mysteries of Physics
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Time Is Absolute, Not Absolute
Physicists long assume that time is absolute and universal, so the same for everyone everywhere. But Einstein's theories of relativity turn Newton's universe on its head. They show that time is interroven with space into what he called spacetime. And they also unveiled that time is relative, rather than absolute. It can speed up or slow down depending on how fast or travelling, for example. The theory enables scientists to picture the universe in a whole new way - as a static four-dimensional block with three spatial dimensions,. So height, width and depth, and time as a fourth. This block contains all of space and time simultaneously, and time doesn't seem to flow.
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