The expanding universe

Question 1

How did the redshift of the distant galaxies compare to the redshift of galaxies closer to us?

Accepted Answer

The more distant the galaxy, the greater the redshift.

Question 2

How can the speed of recession be determined from the red shift?

Accepted Answer

The greater the shift of the spectrum, the greater the speed

Question 3

List the key evidence in favour of the big bang theory.

Accepted Answer

The proportion of elements in the universe, The increasing redshift of light from galaxies with distance, The existence of the cosmic microwave background, The past density of galaxies

Question 4

What major discovery about our universe did Hubble make when considering the Doppler effect?

Accepted Answer

the expansion of the universe

Question 5

The light from the Andromeda galaxy is blue shifted. Explain why it is not red shifted

Accepted Answer

It is gravitationally attracted to our galaxy.

Question 6

Why has the value of Hubble’s constant changed so much since Hubble first calculated it?

Accepted Answer

better telescopes, better understanding of stars

Question 7

What is the ratio of protons to neutrons in the universe?

Accepted Answer

7:1

Question 8

State Hubble’s Law

Accepted Answer

The speed of recession of galaxies and distance is ratio.

Question 9

What did Hubble discover in 1929 that led to the formulation of the big bang theory?

Accepted Answer

galaxies are receding from us, The further away, the faster

Question 10

What causes the red shift in the light from distant galaxies?

Accepted Answer

The expansion of space stretching the light wave

The expanding universe

Questions 10

The expanding universe

Questions 10