Topic 8

Question 1

Cloud of dust and has

Answer 1

Nebula

Question 2

What fusion in stars leads to

Answer 2

Equilibrium between gravitational collapse of star and expansion due to pressure from fusion

Question 3

When elements heavier than iron produced

Answer 3

Supernova

Question 4

Observations of supernova

Answer 4

1998 onwards

Question 5

What isn’t understood about universe

Answer 5

Dark matter and dark energy

Question 6

What force allows planet to orbit in a circular fashion

Answer 6

Gravity

Question 7

Orbiting

Answer 7

Constantly accelerating as always changing direction which also means they are constantly changing velocity
Accelerating due to gravitational pull but since they are already moving it just causes a change in direction
Instantaneous velocity at right angle keeps it travelling in circle

Question 8

What observations of supernova suggest

Answer 8

Distant galaxies receding ever faster

Question 9

Dark matter

Answer 9

Unknown substance that holds galazpxies together and doesn’t emit EM radiation

Question 10

Dark energy

Answer 10

Thought to be responsible for accelerating expansion of universe