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Life Cycle of a Star

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 Nuclear Fusion  hydrogen atoms fuse into helium Creates the intense energy found in stars.

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Life Cycle of a Star

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  1. Life Cycle of a Star

  2. 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

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

  4. 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

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

  6. 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

  7. 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

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

  9. 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

  10. 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

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

  12. Answer • Main Sequence

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

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

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

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

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