The life cycle of a star consists of 5 main stages: 1. Protostars form from huge clouds of gas that collapse under gravity. 2. Main sequence stars like our Sun fuse hydrogen for billions of years. 3. Red giants expand and their outer layers cool as hydrogen runs out. 4. White dwarfs form as red giants collapse under gravity into dense remnants. 5. Black dwarfs are the final remains that cool for eternity, emitting no light.

1. Life Cycle of a Star Waves, Atoms and Space

2. Stage 1 Protostars

6. Stage 2 Main sequence star

11. Stage 3 Red Giant

15. Stage 4 White Dwarf

20. Stage 5 Black Dwarf

25. Stars bigger than our sun! At least four times bigger (you don’t need to know about these for your exams)

26. Stage 4 (for a big star) Red Supergiant

30. Stage 5 (for a big star) Supernova

36. Stage 6 (for a big star) Black hole