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Life Cycle of Stars
 

Life Cycle of Stars

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  • This is a Hubble Space Telescope image (right) of a vast nebula called NGC 604, which lies in the neighboring spiral galaxy M33, located 2.7 million light-years away in the constellation Triangulum.

Life Cycle of Stars Life Cycle of Stars Presentation Transcript

  • 26.2 3/27/07 Star Stuff
  • Forming a Star
    • Nebula
    cloud of dust and gas protostar (takes 50 million years) Contracts and rotates to form a ________
  • A Star is Born!
    • A star when ______ starts
    fusion 10
    • Hydrogen atoms combine
    • to form Helium, other atoms
    • Takes ___ billion years
    • to form
  • Adult Stars
    • Called “main sequence” stars
    • Longest period in life cycle
    • How long depends on star mass
  • A Balancing Act
    • Two forces act on stars
      • Outward force from energy released by nuclear fusion
      • Inward force from gravity
  • Old Age
    • Hydrogen fusion slows
    • Gravity contracts core
    • Core temperature rises
    • Helium fusion starts, releasing even more energy
  • Small Stars
    • Mass of our sun
    • Fusion forms Helium, some Lithium, Carbon and Oxygen
    • Last up to ___ billion years
    10
  • Small Star Old Age Red Giant
    • Helium fusion when H atoms used up
      • produces heavier atoms – carbon & oxygen
    • Temperature rises with Helium fusion
    • Outer layers expand
    • Lasts ____ million years
    100
  • Small Star Death
    • Hydrogen & Helium used up
    white dwarf planetary nebula
    • Outer layers expand to form a ________ _______
    • Star core cools and contracts to form a dim _____ _____
  •  
  • Large Stars
    • 6 x mass of our sun, or more
    • Fusion forms Helium, some Lithium, Carbon, Oxygen and Iron
    • Last up to ___ million years
    10
  • Old Massive Star SUPERGIANT!
    • Can be 100 x larger than our sun
    • Hydrogen used up
    • He fusion in core produces heavier atoms
    • Finally, core made of Iron
  • Dying Large Stars
    • Hydrogen gone - fusion stops
    • Core collapses, then rebounds with explosion
    • SUPERNOVA!
    • Lasts few seconds
  • After Supernova…
    • If mass 1-3 x the sun, final stage is _______ ____
    neutron star pulsar dense
    • Protons and electrons collapse together to form ________
    neutrons
    • Very ______
    • Called ______ if rotating
  • After Supernova 2…
    • If mass > 3 x sun, final stage is _____ ____
    black hole gravity dense
    • Extreme ______
    • Very ______
    • No light escapes from it