Einstein's ideas and the Big Bang.
Today, we understand the Big Bang on the basis of Einstein's revolutionary theory of gravity, which he completed around 1917. Einstein was the first person to realize that empty space is not simply "nothingness" - space has properties of its own. Einstein's theory helps us to picture the expansion of the universe in terms of the stretching of space. That is, new space is continuously coming into existence between galaxies. Thus, the creation of the universe – or at least of the space in the universe – is a continuous process that is still taking place.
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