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III. Stellar Evolution

III. Stellar Evolution. You’re a Superstar!. A. Life Cycle of Stars. 1. 1st Step: a. Stars form from nebulas (cloud of dust & gas). Life Cycle of Stars. 2. 2nd Step: a. As nebula contracts, a small star is formed called a protostar

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III. Stellar Evolution

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  1. III. Stellar Evolution You’re a Superstar!

  2. A. Life Cycle of Stars 1. 1st Step: a. Stars form from nebulas (cloud of dust & gas)

  3. Life Cycle of Stars 2. 2nd Step: a. As nebula contracts, a small star is formed called a protostar b. Eventually, the protostar will begin nuclear fusion (elements coming together)

  4. Life Cycle of Stars 3. 3rd Step: a. Star joins the main sequence 1.) 90% of stars spend life here

  5. Life Cycle of Stars 4. 4th Step: a. What stars end up as depend on mass b. Low mass = red giant (massive star, a lot of fusion) c. High mass = supergiant (largest known star, burn out fast)

  6. Life Cycle of Stars 5. Death of Stars: a. Low and Medium mass stars • Planetary nebula --------- white dwarf (dense, faint star)------ black dwarf (dead star) b. High mass stars • Supernova (exploding star) --------- neutron star(remains of star) or black hole (massive gravity absorbs everything near it)

  7. Relative Size of Stars to Planets

  8. Earth Science Bellringer • Get out your comp. books!

  9. Star Life Cycle Diagram Using pg. 764-765 draw a DETAILED & LABELED diagram of the star life cycle in your composition notebook. Red textbook

  10. Star Life Cycle Questions: • What is a nebula? • How does a star form from a nebula? • How is a protostar different from a star? • What factors determine how long a star lives? • What is the ultimate fate of our sun? • What type of stars may become black holes? • Describe the difference between a white dwarf and a black dwarf. • Describe the two alternatives for a supernova.

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