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Professor Brian Cox explains how evidence for the Big Bang can be found by analysing the colour of starlight. Astronomers have found that the further a star or galaxy is, the redder its light appears. This effect is known as red-shift and it tells us that distant stars are moving away from us. Scientists interpret this as evidence for an expanding universe.
This clip is from:
First broadcast:
5 May 2011

Classroom Ideas

This clip can be used as a starting point to discuss the Big Bang theory. Pupils can discuss and explain how light unlocks the fact that the light is red-shifted when objects are moving away from us in the universe. It can be used to promote discussion to link red-shift with the Big Bang.

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