2.6

Question 1

What is the definition of an absorption spectra?

Answer 1

A spectra of light cross by dark lines

Question 2

What does the absorption spectra tell us?

Answer 2

The composition of the star of galaxy gas cloud because different elements absorb light at different wavelengths to produce each dark line

Question 3

What info does the absorption spectra give us?

Answer 3

How far away a galaxy is, the further away from us the faster the galaxy moves, if the dark lines are red shifted

Question 4

What is Hubble’s law?

Answer 4

The further away the star is, the faster it is moving

Question 5

What is cosmological red shift?

Answer 5

The change in wavelength of radiation since it was emitted due to the expansion of the universe

Question 6

What are the pros of the Big Bang theory?

Answer 6

Based on observation and evidence such as CMBR

Question 7

What are the cons of the Big Bang theory?

Answer 7

Don’t know how it stared

Question 8

What is evidence for the Big Bang theory?

Answer 8

Cosmological red shift of spectra from distant stars and galaxies and CMBR