天文学 TPO42-L2 Distribution of Galaxies

TPO42-L2

Distribution of Galaxies



 

  1. What is the main purpose of the lecture?
  • A. To explain the difficulty of classifying distant objects in the universe
  • B. To introduce a classification system for galaxy clusters
  • C. To present some recent discoveries about the shapes of galaxies
  • D. To describe some differences between galaxies and clusters

 

  1. What did Shapley and Ames discover about the universe?
  • A. Most galaxies are symmetrical.
  • B. More galaxies exist in the universe than was once believed.
  • C. Galaxies occur in clusters throughout the universe.
  • D. Clusters are distributed uniformly throughout the universe.

 

  1. Why does the professor emphasize the number of clusters mapped by Abell?
  • A. To help explain why Abell’s classification scheme was widely adopted
  • B. To explain why Abell was the first astronomer to notice spiral-shaped galaxies
  • C. To provide evidence that Abell’s method of surveying galaxies was superior to that used for previous surveys
  • D. To show how much Abell relied on earlier research

 

  1. What aspects of clusters did Abell use to classify them?
    [CHOOSE 2 ANSWERS]
  • A. The density of the cluster
  • B. The shape of the cluster
  • C. The age of the cluster
  • D. The type of galaxies in the cluster

 

  1. Why does the professor discuss the Coma and Virgo clusters?
  • A. To indicate a limitation of Abell’s survey
  • B. To distinguish between rich and non-rich clusters
  • C. To demonstrate that clusters considered irregular in shape are basically spherical
  • D. To illustrate that the shape of a cluster is independent of the shape of the galaxies within it

 

  1. What is the professor’s opinion of Abell’s assumption that all clusters are about the same size?
  • A. He is surprised that it has been disproved.
  • B. He believes that there is not enough data to support it.
  • C. He is impressed that it has been proved correct.
  • D. He thinks it is Abell’s most important contribution to astronomy.


答案:
B C A AB D C

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