You need to have JavaScript enabled to view this video clip.

Description

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.

This clip also features in: