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Official 42 Lec 2
Question 5 of 6
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 sphericall

D.

To illustrate that the shape of a cluster is independent of the shape of the galaxies within it

正确答案:D

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