Official 42 Lec 2
Question 6 of 6
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

正确答案:C

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