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elliptical galaxy irregular galaxy spiral galaxy

Review Questions

  1. What is a typical size of a galaxy? What is a typical number of stars in a galaxy? How do you know? What holds them all together?
  2. What separates a cluster of stars from a galaxy?
  3. What are four basic distinguishing characteristics between a spiral galaxy and an elliptical galaxy? What kind of galaxy do we live in?
  4. What is the most common type of galaxy? How does their proportion in the universe compare with the proportion of them shown in astronomy books? Explain any differences there may be.
  5. Why are irregular galaxies called irregulars?
  6. Why do you see more galaxies when you look in a direction perpendicular to the Galactic plane than when you look along Galactic plane?

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last updated: 26 May 2001

Is this page a copy of Strobel's Astronomy Notes?

Author of original content: Nick Strobel