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Galaxy Clusters and the Structure of the Universe

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Our knowledge is a torch of smoky pine
That lights the pathway but one
step ahead
Across a void of mystery and dread.

George Santayana
O World, Thou Choosest Not the Better Part

Questions to Explore:
  • To what extent are galaxies found in clusters rather than in isolation?
  • Are galaxies in clusters different from galaxies not in clusters?
  • How did clusters of galaxies form?
  • What evidence do we have that there is dark matter between the galaxies in clusters?
  • How are galaxies and clusters of galaxies distributed in space?
  • Why are there enormous voids in which there are few galaxies?

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