Stars . 4.5 / 5 based on 8 ratings ? PhysicsAstronomyGCSE Created by: izzyCreated on: 08-07-12 18:41 Birth of a star. Perticles and clouds come together due to gravity. They merge, forming a protostar. The protostar gets hotter and denser. If it gets hot enough, nuclei of hydrogen fuse. This releases energy, causing the star to grow and be born. 1 of 3 Shining stars/Sequence stars. Energy released keeps core hot, so fusion continues. Radiation flows out steadily. Gravity and pressure balanced. 2 of 3 End of a star. All hydrogen nuclei used up. Smells, cools, turns into a red giant. Helium and light elements used for fusion. Elements run out - fusion stops. Collapses in on itself, goes from red to yellow to white dwarf. Fades out and goes cold OR turns into a supernova depending on the size. 3 of 3
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