MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Big Bang. Computer artwork 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. Background microwave radiation, which is thought to be an afterglow of the explosion, has also been discovered.
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