Space

Question 1

what consists our solar system?

Answer 1

sun
eight planets+dwarf planets that orbit the sun
natural satellites eg moon that orbit planets

Question 2

how was the sun formed?

Answer 2

a cloud of dust and gas (nebula) pulled together by gravitational tension

Question 3

the life cycle of a star

Answer 3

Refer to diagram

Question 4

how are elements heavier than iron produced?

Answer 4

in a supernova

Question 5

how are elements distributed?

Answer 5

supernova - explosion of a massive star

Question 6

how does gravity change the velocity of circular orbits but not their speed?

Answer 6

velocity is speed in a given direction
direction of object constantly changes=velocity constantly changes

Question 7

why does the radius change if the speed changes?

Answer 7

speed increases=radius of orbit decreases

higher speed=greater force of gravity to prevent it flying off into space=closer to earth=gravitational force greater=stable orbit

Question 8

what is red-shift?

Answer 8

The further away the galaxies, the faster they are moving and the bigger the observed increase in wavelength

Question 9

theories about the universe

Answer 9

big bang -
steady state -