ERICH SCHREMPP / SCIENCE PHOTO LIBRARY ERICH SCHREMPP / SCIENCE PHOTO LIBRARY
Big Bang. Artist's impression of the Big Bang, the titanic explosion that cosmologists believe created the Universe. Recent estimates suggest the Big Bang occurred about 12 billion years ago, although the 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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