The observation that the universe is expanding has led to the current view that about 14 billion years ago the currently visible universe was concentrated into a point-like region that exploded in an event called the Big Bang .
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- (no access) - Duward Shriver, Mark Weller, Tina Overton, Jonathan Rourke, Fraser Armstrong - Inorganic Chemistry (c2014, Macmillan Education (W. H. Freeman)).pdf, p27
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