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Ten years before he discovered the theory of general relativity, Einstein realized that time and space were not two separate entities, but two aspects of one and the same entity.
This discovery is called the “Special Theory of Relativity.” We understand two events (for example, the arrival of Christopher Columbus in America and the death of John Lennon) as ordered in time, that is, one occurs before and the other after. We usually think of time as something all-encompassing, so that it makes sense to ask what exactly is happening at this moment somewhere else in the universe. But that is not the case. When two events occur in two places that are sufficiently far apart, it generally makes no sense to say which one happened first. It also makes no sense to ask what exactly is happening at this moment, for example in the Andromeda galaxy. The reason is that time does not flow in the same way everywhere. We have our own time, and the Andromeda galaxy has its own, and these two times, in general, cannot be related.
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