The big bang is a theory which says that the whole universe started expanding billions of years ago in one place with a large explosion.
When we study the stars it can be shown that all of the galaxies are moving away from us.
We can also observe that galaxies further away are moving quicker.
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Evidence for big bang (including red shift)
Microwave radiation can be detected from the big bang explosion. This microwave radiation is shown as interference in badly tuned radios.
Red shift can be used to show that the universes are moving further away.
Red shift works, as when light sources move away, the wavelengths become longer than a closer source. This means that the wavelengths shift towards the red end of the spectrum to show the source is moving.
The further away the more the dark line is towards the red end of the spectrum.
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