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Explained in 60 Seconds: A collaboration with Symmetry Magazine, a Fermilab/SLAC publication (page 31)
Mark Trodden

Key Words
Big Bang, Explained in 60 Seconds

The Big Bang refers to the start of the rapid expansion of our Universe. Edwin Hubble discovered this expansion in the 1920s through observations of faraway galaxies, showing that the distances between them are growing as time passes. This stunning discovery is beautifully explained by general relativity — Einstein’s theory of gravity — augmented by two new concepts, dark matter and dark energy.