Big Bang theory evidence Flashcards
(4 cards)
1
Q
What is the big bang?
A
The big bang theory predicts that all galaxies are receding from earth.
The recessional veloctiy is proportional to its distance from earth.
2
Q
How is red shift evidence for big bang?
A
Radiation from planet shows increase in wavelength or redshift.
Change in wavelength is caused by motion of galaxy.
3
Q
Explain blue shift?
A
A galaxy approaches earth.
Caused by gravitational attraction.
4
Q
Explain CMBR
A
Formed as gamma radiation at Big bang
Galactic red shift to microwave wavelength
Intensity is uniform in all directions.
Corresponds to a temperature of 2.7K
