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Types of galaxies


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Presentation on the types of galaxies for astronomy class

Published in: Education, Technology, Design
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Types of galaxies

  1. 1. H. Taylor
  2. 2. What is a galaxy? A galaxy is a massive, gravitationally bound system consisting of stars, stellar remnants, an interstellar medium of gas and dust, and dark matter
  3. 3. How many are there? Estimated that there are 170 billion different galaxies Space in between galaxies is known as “intergalactic space”
  4. 4. Type and Classification There are 3 main types of galaxies, though subtypes are not uncommon 1. Spiral galaxies 2. Elliptical galaxies 3. Irregular galaxies
  5. 5. Spiral galaxies 3 main components 1. Bulge 2. Disk 3. Halo
  6. 6. Elliptical galaxies Shaped like an elongated sphere Sometimes look almost football shaped Classified based on elongation from a perfect circle • Scale from E0 to E7
  7. 7. Irregular galaxies Have no set structure Divided into two groups: 1. Irr I 2. Irr II
  8. 8. Works Cited