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8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
8th Grade-Ch. 4 Sec. 3 Lives of Stars
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8th Grade-Ch. 4 Sec. 3 Lives of Stars

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  • 1. Sec. 3 Lives of Stars
  • 2. lifetimes of stars
    • how long a star lives depends on its mass
    • greater the mass- shorter the lifetime
  • 3. star’s life cycle
  • 4.
    • nebula = large cloud of gas & dust
    • birthplace of stars
  • 5. Image by NASA/STSCI/Nolan Walborn/Hubble Heritage Team nebula
  • 6.  
  • 7. 1. protostar
    • Earliest stage in star’s life
    • Contracting cloud of gas & dust w/ enough mass to make star
  • 8.  
  • 9. sun 2. main sequence star (developed star)
  • 10. 3. red giant or supergiant start to run out of fuel- outer layers expand
  • 11.  
  • 12.
    • When star runs out of fuel, becomes :
    • white dwarf or
    • neutron star or
    • black hole
    depends on star ’s mass
  • 13. small & medium stars become
    • white dwarf-
            • cooled blue-white core left behind
            • about size of Earth
    • same mass as Sun
  • 14. This Hubble Space Telescope image shows Sirius A, the brightest star in our nighttime sky, along with its faint, tiny stellar companion, Sirius B. Astronomers overexposed the image of Sirius A [at center] so that the dim Sirius B [tiny dot at lower left] could be seen.
  • 15.
    • 5. black dwarf-
    • when white dwarf stops glowing
  • 16.
    • giant & supergiant stars
    4. supernova - explosion of a dying giant or supergiant star
    • one of the most dazzling events in the universe
  • 17. supernova
  • 18.
    • 5. neutron star- small, dense star
            • - 3 X mass of Sun
  • 19. pulsar
    • Spinning neutron star
    • Emits pulses of radio waves
  • 20.  
  • 21.
    • 5. black hole- most massive stars
          • form from stars that have 40 times the mass of sun
          • gravity is so strong that nothing can escape- not even light
          • x-rays detect them
  • 22. The remains of the most massive stars collapse into black holes. This artist’s impression shows a black hole pulling matter from a companion star.
  • 23. Not even light can escape from a black hole.
  • 24. ( unsequenced human life cycle page ) nebula protostar developed star supergiant supernova black hole
  • 25. nebula protostar protostar protostar
  • 26. Life Cycle of a Star nebula = huge cloud of gas & dust protostar = beginning of star red giant or supergiant = star expands, outer layers cool supernova = enormous explosion of a giant star white dwarf = dim star that forms from a red giant black dwarf = runs out of fuel dead star black hole = core collapses to a tiny point with a very strong gravitational pull neutron star = dense remains of a massive star’s core low mass star high mass star very high mass massive star developed star (main sequence star)

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