Take out 2 sheets of paper for notes To Do Take out 2 sheets of paper for notes Ch. 15-2 (part 3) | Types of Stars Ch. 15-3 | Galaxies

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

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

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

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

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

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

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