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4.3 Galaxies are Different Shapes and Sizes


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Presented on Tuesday November 24th. This follows the textbook- Chapter 4 Section 4.3

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4.3 Galaxies are Different Shapes and Sizes

  1. 1. Low- Mass StarsBothHigh-Mass Stars<br />Less time in Main Sequence- use fuel quickly<br />Main sequence into Super Giant<br />No more fuel- super giantexplode<br />Supernova<br />Become either:<br />Neutron Star<br />Black Hole<br />More time spent in Main Sequence-use fuel more slowly<br />Star expands into a giant star<br />Giant star sheds outer layers become a white dwarf<br />Form inside a nebula<br />Produce energy by fusion<br />Go through Main Sequence stage<br />
  2. 2. Galaxies have different sizes & shapes<br />Space Science<br />Chapter 4: Section 4.3<br />
  3. 3. What is a Galaxy?<br />huge grouping of stars, gas, and dust held together by gravity<br />
  4. 4. How did the Milky Way get it’s name?<br />because of its milky and hazy appearance<br />
  5. 5. The Milky Way Galaxy is shaped like a disc with a huge bulge in the middle.Why do we not see the center of the galaxy from Earth?<br />The center of the galaxy is hidden by all of the surrounding dust.<br />
  6. 6. Review: What is a light-year?<br />The distance it takes for light to travel in one year<br />Which is?<br />6 trillion miles<br />
  7. 7. The main bulge of the galaxy is 26,000 light years from the sun.<br />
  8. 8. The Milky Way contains clouds of dust and gas called nebula. Review: Why are nebula important?<br />Nebula are the birth place of stars<br />
  9. 9. How we Classify Galaxies:<br />Spiral Galaxy<br />Have arms of stars and dust that curve away from the center <br />Has a central bulge which consists mostly of old stars<br />Spiral arms are new stars<br />
  10. 10. Elliptical Galaxy<br />Shaped like spheres or eggs<br />No dust or gas between stars<br />All stars are old<br />
  11. 11. Irregular Galaxy<br />Faint galaxies<br />No definite shape<br />Smaller than other galaxies<br />Have fewer stars<br />Contains mostly young stars<br />
  12. 12. Types of Galaxies- KIM Strategy<br />
  13. 13. Memory Clue<br />In the last column draw a picture of the type of Galaxy<br />Refer to page 132 if you need a reference point<br />When finished:<br />Get a Picture Sort Sheet from Miss. Hudak<br />Cut and sort the pictures according to their shape<br />Staple them to the appropriate column<br />
  14. 14. Review<br /><br />