1. Life Cycle of a Star

2. Lives of a star
Begin as Nebulas: A hot clouds of gas, where stars are born

3. Lives of a star
2. Protostars are formed by gravity pulling together dust and gases until they get hot enough to fuse together

4. Lives of a star
3. Main sequence: 90% of stars that burn through their hydrogen slowly (adult life)

5. Lives of a star
4. Soon a star begins to run out of fuel: When there is no more elements to fuse together

6. Life of a Star A stars life depends on its mass For example:
The smaller the star, the longer it will live
The bigger the star, the shorter it will live
For example:
Smaller than the sun: live 200 billion years
Sun’s size: live 10 billion years
Larger than the sun: less than 10 billion years

7. Death of a star Small –Medium Stars:
Red Giant: As they run out of fuel, their outer layer begins to expand and they become RED GIANTS
Red Giant

8. Death of a star Small –Medium Stars:
2. White Dwarf: When the outer layer drifts into space, only the hot core is left forming a WHITE DWARF
White Dwarf

9. Death of a star Small –Medium Stars:
3. Black Dwarf: When the white dwarf stops glowing it becomes a BLACK DWARF

10. Death of a star Large Stars:
Super Giants: Instead of forming a red giant, large stars form SUPER GIANTS

11. Death of a star Large Stars:
2. Super Nova: Super giants can suddenly explode creating a SUPERNOVA

12. Death of a star Large Stars: 3. Three outcomes to a supernova:
Recycled material makes a new star
Neutron Star can be formed: this is a very dense star (same amount of mass as the sun, but the size of Houston)
The star can become a black hole

13. Small/Medium Size Star
Life of a Star
White
Dwarf
Red Giant
Black
Dwarf
Small/Medium Size Star
Nebulae/
Protostar/
Main Sequence

14. Life of a Star Large Size Star Super Giant Supernova Recycled Star
Nebulae/
Protostar/
Main Sequence
Large Size Star
Recycled
Star
Black
Hole
Super
Giant
Neutron
Star
Supernova

15. Life of a Star