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The Big Bang
The best theory for the creation of the universe is the Big Bang. Professor Brian Cox explains how evidence for the Big Bang can be found by analysing the colour of light from stars. White light can be split using a prism or water drops, to create a rainbow. The colours are determined by the wavelength of the light. However the wavelength can be stretched by galaxies moving away from each other. This causes the colour to change. Hence distant stars appear red. This is evidence that stars and galaxies were once close together and have moved apart. It is also evidence that the universe had a beginning from which it expanded. Created especially for Class Clips from the BBC series Wonders of the Universe, first broadcast in April 2011.
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