Chapter 12 - Red Shift Flashcards
What is the red shift of a distant galaxy?
The shift of longer wavelengths and lower frequencies of light from it because the galaxy is moving away from us
What is the red shift change called?
Doppler effect
What happens to the red shift if the galaxy/star is moving away from us faster?
Greater the red shift is
Do all distant galaxies show red shift?
Yes
What conclusion is reached which is shown by distant galaxies moving away from us?
The universe is expanding
What is the big bang?
The theory that the universe started from a massive explosion from a very small point
What has happened ever since the big bang?
The universe has been expanding
What background radiation was produced straight after the big bang?
Cosmic microwave background radiation (EM)
What is CMBR?
High energy gamma radiation, wavelengths have increased due to expanding universe
What needs to be true about the density of the universe if it is expanding
Density needs to be less than the certain amount
What needs to be true about the density of the universe if it is not expanding
Density needs to be greater than the certain amount
