The Expanding Universe Flashcards
What is red shift?
This is when light observed from distant galaxies has been ‘shifted’ towards the red end of the spectrum. It means the frequency has decreased and the wavelength increased.
What is blue shift?
This indicates that a galaxy is moving towards us.
He further away the galaxy…
The bigger the red shift.
The most distant galaxies are…
Moving the fastest.
What does red shift provide evidence for?
That the universe is expanding and so the Big Bang happened.
The distant galaxies are moving away from each other so…
The universe is expanding.
What is the Doppler effect?
This states that as a wave source moves towards an observer, the wavelength decreases but the frequency increases. So, when the wave source moves away from the observer, the wavelength increases but the frequency decreases.
