MARTIN BOND / SCIENCE PHOTO LIBRARY MARTIN BOND / SCIENCE PHOTO LIBRARY
Big Bang. Conceptual image depicting the Big Bang, the huge explosion that cosmologists believe created the Universe. The Big Bang occurred about 12 billion years ago, although the exact figure is uncertain. The Big Bang theory is based on the fact that the visible Universe is still expanding outwards from a central point, and on the discovery of background microwave radiation thought to be an afterglow of the explosion.
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