Origins of the Universe

Question 1

what is the Doppler effect?

Answer 1

If a wave source is moving relative to an observer there will be a change in the observed wavelength and frequency.

[e.g. a ambulance changes pitch as it drives past you]

Question 2

how does the Doppler Effect provide evidence for the big bang?

Answer 2

as galaxies get further from us they become faster

this causes a bigger shift in the observed increase of wavelength, called red-shift

shows the universe is expanding, supports the universe may have began from a small point

Question 3

how does cosmic microwave background radiation provide evidence for the Big Bang?

Answer 3

It comes from radiation that was present shortly after the beginning of the universe

only theory that can explain its existance