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December 16, 2011

December 16, 2011. Objective: Construct a model of the life of a star. Agenda Notes Life of a Star Project Contact. Life Cycle of a Star. 1 st Stage of Life Ball of gas and dust that is pulled together by gravity Nuclear fusion starts as gas cloud becomes denser and hotter

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December 16, 2011

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  1. December 16, 2011

  2. Objective: Construct a model of the life of a star Agenda Notes Life of a Star Project Contact

  3. Life Cycle of a Star

  4. 1st Stage of Life • Ball of gas and dust that is pulled together by gravity • Nuclear fusion starts as gas cloud becomes denser and hotter • Nuclear Fusion hydrogen atoms fuse into helium • Creates the intense energy found in stars

  5. Four types of stars make up the life of a star • Main Sequence • Giants • Super Giants • White Dwarfs

  6. Main Sequence (the Sun) • 2nd stage • Longest stage • Hydrogen changes into helium which creates enormous amounts of energy • The size of the star does not change much

  7. Giants and Supergiants • 3rd stage • Main Sequence star becomes a red giant • Red giant star that expands and cools once is loses all its hydrogen • Center shrinks and atmosphere grows large and cools

  8. White Dwarf small hot star that is the leftover center of an older star • Final stage • Can shine for billions of years before they extinguish Observe life of a star (link)

  9. Age of stars • Average stars become red giants then white dwarfs • More massive stars explode into a variety of objects

  10. Supernova gigantic explosion in which a massive star collapses • Occurs after a massive star uses up its fuel source • Neutron Star a star that has collapsed to a point at which all particles are neutrons • A neutron star that spins and sends out beams of radiation is called a pulsar

  11. Black Hole an object that is so massive that light cannot escape its gravity • Remnants of a supernova • Astronomers can detect black holes by using X-ray telescopes

  12. Hertzprung-Russell Diagram • Shows the relationship between a star’s surface temperature and absolute magnitude • Used to study the lives of stars • Most stars lie along the main sequence portion of the diagram

  13. Question 1 • What kind of a star is the sun?

  14. Answer • Main Sequence

  15. Question 2 • What is the H-R diagram?

  16. Answer • A graph that shows the relationship between a star’s temperature and absolute magnitude

  17. Question 3 • What are the four main types of stars?

  18. Answer • Main-Sequence • Giants and Supergiants • White Dwarfs

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