Flashcards in Origins of the Universe Deck (3)
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