Revise GCSE Physics


Question:Can you summarise the stages of a stars 'life-cycle'?

Summary of 'life-cycle' of a star.

Early life history of a star:

1.Interstellar gas cloud (a Nebula)

2.Gravitational collapse producing a proto-star

3.Thermonuclear fusion

4.Long period of normal life (main sequence)

5.End depends on mass of star.

End of the 'life-cycle' of a small star:

6.Red giant

7.Planetary nebula

8.White dwarf

End of the 'life-cycle' of a large star:

6.Red supergiant

7.Supernova

8.Neutron star or black hole (for massive stars).

NB A small star has less than 3 times the mass of the Sun.