Astronomy

Question 1

where did the universe begin 14 billion years ago

Answer 1

very small region that was extremely hot and dense

Then there was a giant explosion, which is known as the Big Bang

Question 2

what did the big bang cause

Answer 2

This caused the universe to expand from a single point, cooling as it does so, to form the universe today
Each point expands away from the others

Question 3

what does it mean if the galaxies are further away

Answer 3

the further away they are the faster they move

Question 4

what is the steady state theory

Answer 4

as galaxies move apart, new ones will be formed in the gaps in between them
This implies the density of galaxies remains the same as the universe expands

Question 5

what does steady state believe

Answer 5

always existed more or less as it is seen now

Question 6

what is the evidence for big bang

Answer 6

Red shift and CMB

Question 7

what is red shift

Answer 7

to prove galaxies are moving away from each other we can say that:

• different elements absorb different frequencies of light
• each element produces specific patter of dark lines corresponding the frequency is absorbs on EM spectrum
• now looking at light from distant galaxies we can see the same patterns but at lower frequencies
• higher wave length therefore pattern shifted towards red end of spectrum - red shift
• this suggest that all distant galaxies are moving away
• distant galaxies have greater red shift - higher wave length

Question 8

how does heavier matter move

Answer 8

travel at a slower speed, closer to the source of the explosion

Question 9

what is CMB radiation

Answer 9

according to big bang theory universe was very hot and dense therefore must’ve emitted thermal energy.
this is microwave radiation = detected that low frequency electromagnetic radiation coming from all parts of universe mainly microwave part

Question 10

why does CMB only back up big bang theory

Answer 10

as it shows that the universe had a beginning whereas steady state theory states there was no beginning or end