P16 - space

Question 1

what is a satellite (natural and artificial)

Answer 1

an object that orbits another, moon is natural, weather satellite is artificial

Question 2

how are stars formed

Answer 2

nebula (cloud of dust and gas), collapses in on itself due to gravity, protostar, starts nuclear fusion when gets how enough

Question 3

why does the volume of a main sequence star stay constant

Answer 3

fusion pressure = gravity

Question 4

what does a star become after running out of hydrogen

Answer 4

red giant, red supergiant if large enough

Question 5

what does a red giant / supergiant become

Answer 5

red giant - white dwarf then brown dwarf
smaller red supergiant - neutron star
larger red supergiant - black hole

Question 6

what is escape velocity

Answer 6

the velocity needed to overcome gravity and escape orbit

Question 7

what are the two types of artificial satellite

Answer 7

low polar - covers whole world
geostationary - higher up, stays on one point over equator

Question 8

what is redshift

Answer 8

as the emitter of light moves away, the light is stretched and becomes more red

Question 9

how does redshift support big bang

Answer 9

more redshift in further away galaxies, must be moving faster, so all came from one point

Question 10

what is CMBR

Answer 10

cosmic microwave background radiation, the radiation left over from the start of the universe