Light from Galaxies is Red-shifted Flashcards
1
Q
Most galaxies seem to be …… each other?
A
Moving away from
2
Q
What do different elements absorb?
A
Different frequencies of light
3
Q
What happens when light is passed through a sample of an element?
A
A pattern of dark lines is produced - with a dark line at each of the frequencies in the visible part of the EM spectrum that the element absorb
4
Q
What do we see when we look at light from distant galaxies?
A
The same patterns but at slightly lower frequencies than they should be
5
Q
What has happened to the patterns?
A
They have been shifted towards the red end of the spectrum - red-shift
6
Q
See diagram page 78
A
Ok
