Stars dont stay the same forever . Oven billions of yeaRS the amount of hydrogen in a star decreases why
Converted into helium during nuclear fusion
describe how a massive star will change at the end of a main stable period
expands into a super red giant
expands and contracts in an explosion/supernova
forms A neutron star and then a black hole
the inner planets of the solar system contain atoms of the heaviest elements . Where did the atoms come from
b) that does this tell us about the age of the solar system compared with many of the Stars in the univers
Supernova
B) younger
scientists think that at all the eElements of earth are also present in the universe
Name the process by which these elements were formed
fusion
scientists think that at all the eElements of earth are also present in the universe , where did all the elements come from
Stars
What evidence is there to suggest that the sun was formed from the material produced when an earlier star exploded
Presence of nuclei from n heaviest stars
scientists think that at all the eElements of earth are also present in the universe
what caused the elements to be distributed throughout the universe
Supernova
The sun is at that stable stage of it's life
Explain in terms of forces acting on the sun , what this means
It has 2 balancing forces
gravity causing it to contract
heat causing it to expand
Explain how stars produce energy
nuclei of light elements fuse
each fusion releases energy
lots of reactions
Explain what is meant by a black hole
Matter with such a high density that electromagnetIc radiation is pulled in
What is produced as the gases from a star spiral into a black hole
x rays
describe and explain the changes that could take place for a star to become a whittle dwarf
Hydrogen used up
expands
becomes red giant
contracts under gravity
forms a white dwarf
describe and explain the changes that could take place for a star to become a black hole
It may explode
and become a supernova throwing dust and gas into space leaving a dense neutron star