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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
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To Do • Take out 2 sheets of paper for notes • Ch. 15-2 (part 3) | Types of Stars • Ch. 15-3 | Galaxies
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 collapseto form a black hole • Black hole – so small and massive that gravity is so strong that even light can not escape its pull
