GCSE physics 2

Stars dont stay the same forever . Oven billions of yeaRS the amount of hydrogen in a star decreases why 

describe how a massive star will change at the end of a main stable period

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

scientists think that at all the eElements of earth are also present in the universe 
Name the process by which these elements were formed  

scientists think that at all the eElements of earth are also present in the universe , where did all the elements come from 

What evidence is there to suggest that the sun was formed from the material produced when an earlier star exploded 

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

The sun is at that stable stage of it's life 
Explain in terms of forces acting on the sun , what this means

Explain how stars produce energy

Explain what is meant by a black hole 

What is produced as the gases from a star spiral into a black hole 

describe and explain the changes that could take place for a star to become a whittle dwarf 

describe and explain the changes that could take place for a star to become a black hole