LUDEK PESEK / SCIENCE PHOTO LIBRARY LUDEK PESEK / SCIENCE PHOTO LIBRARY
Artist's impression of galaxies being formed in the aftermath of the Big Bang, the titanic explosion which cosmologists believe created the Universe about 15 billion years ago. The theory of the Big Bang is based on the fact that the visible universe is still expanding, & on the discovery of background radiation - the so-called "microwave background" - that is believed to be the remnant from the primordial explosion. In this picture, the giant spiral clouds of gas have already started condensing into what will later become galaxies. Galaxy formation is thought to have commenced when the Universe was about 100,000 years old. Produced between 1968 and 1972.
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