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The birth, life, and death of stars.

Stellar Evolution. The birth, life, and death of stars. Models of star evolution. Star Birth. Large clouds of gases and dust called nebluae are the birthplace of stars. Star Birth.

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The birth, life, and death of stars.

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  1. Stellar Evolution The birth, life, and death of stars.

  2. Models of star evolution

  3. Star Birth • Large clouds of gases and dust called nebluae are the birthplace of stars

  4. Star Birth • Eventually, gravity causes the cloud to collapse. This flattening results in a disk-like object.

  5. Star Birth • Pressure and temperature increases as a protostar is formed. When fusion is triggered true star is born.

  6. Main sequence star • Most stars spend 90% of their lives in this stage • Outward gas pressure reaches balance with gravity (equalibrium)

  7. Red Giant • Star expands and as the surface cools, it turns red. • Occurs as a result of a star running out of fuel (hydrogen)

  8. Death of a Star • All stars, regardless of size, eventually run out of fuel and collapse. • Can form black holes, white dwarfs, supernovae, etc.

  9. How star masses affect life cycles • Click here to watch the life cylce of different sized stars

  10. Question What determines a star’s life cycle? Its Mass

  11. Medium Star Life Cycle

  12. H-R Diagram

  13. H-R Interactive • Click here to watch a star go through it's life cycle

  14. Review • Click here to answer question using an H-R Diagram

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