BELLWORK

1. BELLWORK • Are stars BORN??? • Take a moment to think about our own Sun, and write down an idea about how it was formed using what we have learned so far.

2. Life Cycle of STARS

3. The Stellar Nursery

4. Birth of a Star • Stars are born out of a ball of gas, called a Nebula. This is the stellar nursery. • Gas and particles are pulled together, their mass condenses . • The main ingredient is Hydrogen.

5. What Causes the Collapse? • What did we say about all matter before? • All matter is attracted to other matter = gravity.

6. Different Types of Stars • Stars can become different types after the nursery. • Main-Sequence stars • Giants • Supergiants • White Dwarf

7. Stars Get OLD • Stars start out of the nursery. • Gain material slowly. • Stars lose material through nuclear fusion, over billions of years. • Sometimes they lose material REALLY FAST!

8. Example of Supernova

9. End stages of a Star • After middle age, retirement. • Our Sun will become a red giant eventually, then a white dwarf most likely. • More massive stars explode • Supernova!!!!!!!!!!!!!

10. Supernova • The mass of a star collapses. • It explodes violently as seen in the animation. • The result: • Neutron Stars • Pulsars • Black Holes

11. Death of a Star • Supernovas A supernova is a gigantic explosion in which a massive star collapses. • Neutron Stars and Pulsars A star that has collapsed under gravity to the point at which all of its particles are neutrons is called a neutron star. If a neutron star is spinning, it is called a pulsar. • Black Holes A black hole is an object that is so massive that even light cannot escape its gravity.

12. Different Types of Stars • Your book walks you through the different types of stars. • Pages 40-45 • Were going to create a concept map of this process. • What is a concept map?

13. Concept Map Stellar Nursery: Nebula’s are giant clouds of gas