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Flashcards in Origins of the Universe Deck (3)
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what is the Doppler effect?

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]


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

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


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

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

only theory that can explain its existance