1. Take out 2 sheets of paper for notes
To Do
Take out 2 sheets of paper for notes
Ch (part 3) | Types of Stars
Ch | Galaxies

2. 15-2 (Part 3) | The Life Cycle of Stars

3. The Aging of Massive Stars
Massive stars use their hydrogen much faster than stars like the sun do
Since these stars generate more energy, they are very hot, but also have shorter lives.
They also have very dramatic ends

5. Supernovas
A supernova is a gigantic explosion in which a massive star collapses and its outer layers are blasted into space
Even larger stars can become neutron stars, pulsars, and black holes

6. Neutron Stars
After a supernova, the center becomes a very dense and small cluster of neutrons
This is called a neutron star
A single teaspoon of this weighs 100 million metric tons on earth
A neutron star 20x smaller than our sun would emit the same energy as 100,000 suns

7. Pulsars
A pulsar is a swiftly rotating neutron star
Can only be detected when beams of radiation sweep past Earth

8. Black Holes
Leftovers of supernovas can be so massive that they collapse to form a black hole
Black hole – so small and massive that gravity is so strong that even light can not escape its pull

9. WAIT… You have more notes!!