universe

2. nuclear fusion release large amounts of heat and light
4. measures how bright a star appears from Earth
8. gases burns out and star skrinks
11. ? depends on its surface temperature
12. Large area containing everything that has ever existed
13. A system that contains large numbers of stars
14. they are 8 times the mass of the sun
15. The force of gravity pulls and balances the star to become a consistent size
16. a neutron star collapses further, its gravity and density become so strong that nothing can escape it
17. Consists of a star and all the objects orbiting it
19. If a red giant has a large enough mass, it has a different end

1. a scatter graph of stars showing relationship between the stars' absolute magnitudes vs surface temp and colour
3. the remains of a supernova are extremely dense which results in a solid core
4. measure how bright a star is as if all stars are the same distance
5. the amount of helium decreases, and the outer regions of the red giant fade away
6. matter making up a star is hurled into space along with huge amounts of energy
7. A mass of hydrogen and helium gas that shines brightly
9. a theory that describes how the universe developed from a small, infinitely dense point called a singularity into the massively expanded space it is today
10. used to measure the distance of stars from the Earth
17. measures distance of stars from earth
18. forces inside the star reach a new hydrostatic equilibrium and the star turns into a ?