Topic 8.2- Life Cycle of Stars

Question 1

What is a nebula

Answer 1

A big cloud of dust and gas

Question 2

How does a nebula change to the next stage

Answer 2

Overtime it forms a protostar with high amounts of gravity

Question 3

As a protostar grows in size and attracts more particles from the surrounding nebula, what changes may take place within it

Answer 3

• The temperature increases
• Nuclear fusion could initiate
• It becomes more dense

Question 4

what is the pressure like in a main sequence star

Answer 4

the outward pressure from nucleaur fusion is perfectly balanced with the inward pressure from gravity

Question 5

After the main sequence, what could a star become?

Answer 5

• red giant
• red super giant

Question 6

What do main sequence stars fuse to form what

Answer 6

hydrogen into helium

Question 7

How are elements heavier than iron formed

Answer 7

in supernovas

Question 8

What does a red giant become

Answer 8

white dwarf then black dwarf

Question 9

What does a red super giant become

Answer 9

a supernova

Question 10

What happens after a supernova explosion

Answer 10

a black hole or a neutron star

Question 11

What is instantaneous velocity

Answer 11

the direction the moon is travelling

Question 12

What is Cosmic microwave background radiation

Answer 12

electromagnetic radiation that is observed in all directions

Question 13

What has happened to the universe since the big bang and what effect has this had on radiation

Answer 13

it has cooled overtime so radiation now has a lower frequency