7.8-7.15 The Expanding Universe

Question 1

What is the Big Bang theory?

Answer 1

The theory that 13.7 billion years ago all the matter in the universe was concentrated into a single tiny point

Question 2

What is the steady state theory?

Answer 2

Theory that the universe has always existed and that the universe is constantly expanding and creating matter as it expands

Question 3

Whats the similarities of the Big Bang and steady state theories?

Answer 3

.Red shift supports both theories

Question 4

What’s the differences between The Big Bang theory and steady state theory?

Answer 4

Big Bang takes into account cosmic microwave background radiation where as steady state does not
.Big Bang states that 13 billion years ago the density of the Earth would be much higher where as steady state believes it should be the same as it was at the start

Question 5

Give two bits of evidence that supports the Big Bang theory

Answer 5

.Red shift shows universe is expanding so it must have been formed from a single point
.When the universe was very young everything was hot and would have released short wavelength radiation and this is visible when you point a telescope to the sky
.This proves the universe has cooled and expanded since

Question 6

Give two bits of evidence for Steady State theory

Answer 6

.Red Shift

.As universe expands matter is constantly being created so there is a constant density of matter in the universe

Question 7

What is the current accepted model for the start of the universe?

Answer 7

The Big Bang theory

Question 8

Is there more evidence for the Big Bang or the steady state theory?

Answer 8

Big Bang

Question 9

What is red shift?

Answer 9

.When a light source moving away has a greater wavelength and lower frequency.

Question 10

What will be seen if a wave source is moving relative to an observer?

Answer 10

.There will be a change in observed frequency and wavelength

Question 11

How does the red shift of galaxies provide evidence for the universe expanding?

Answer 11

.Red shift increases as the distance away from the Earth increases

Question 12

How does Red shift provide evidence for the Big Bang?

Answer 12

.Shows universe is expanding meaning it must of been formed from a single point

Question 13

How does red shift provide evidence for steady state theory?

Answer 13

.Shows that the universe is expanding

Question 14

How did the discovery of CMB lead to the Big Bang theory becoming the accepted model?

Answer 14

.When the universe was very young everything would be very hot and should have emitted short wavelength radiation
.This radiation overtime would have become microwaves
.This radiation is present whenever you point a telescope to the sky
.Which proves the hot young universe has expanded and cooled since