VICTOR DE SCHWANBERG / SCIENCE PHOTO LIBRARY VICTOR DE SCHWANBERG / SCIENCE PHOTO LIBRARY
Big Bang and galaxies. Illustration showing the galaxies that formed following the Big Bang (centre), the initial expansion of all the matter in the universe from an infinitely compact state some 13.7 billion years ago. The initial conditions are not known, but less than a second after the universe formed temperatures were trillions of degrees Celsius and the primordial universe was much smaller than an atom. As expansion occurred, matter formed and coalesced into the galaxies (around 500 million years later). The continuing recession of the galaxies from each other is a key piece of evidence for the Big Bang theory.
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