The Big Bang Theory
This theory states that all matter was once concentrated at one single point which exploded and began to expand rapidly. It is still expanding today. The universe is around 13.7 billion years old.
CMBR Cosmic Microwave Background Radiation can be detected in space, this is radiation which is left from the Big Bang.
The Doppler effect
When a source of waves is moving towards you, the wavelength decreases and the frequency increases
This makes sound waves higher pitched.
When a source of waves moves away from you, the wavelength increases and the frequency decreases so sound waves are lower pitched.
Red shift
We inspect our sun which contains helium and we know the spectrum of light from the sun where helium has absorbed light.
When we look at distant stars in other galaxies we see the same pattern but shifted to the red side of the spectrum with wavelengths increased and frequencies decreased.
This means that because of the doppler effect, galaxies are proven to be moving away from us.
With galaxies further away, the red shift is increased.
This suggest that the universe is expanding and everything is moving away from everything else
CMBR
Microwaves comes from every direction in space.
It comes from radiation created at the beginning of the universe.
The Big Bang theory is the only that explains why CMBR exists.
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