48. What conclusion can be made about 54. According to the passage, the Local
Group
galaxies that are not found in clusters? and the Virgo Cluster have which of the
(A) They have never been observed. following in common?
(B) They are larger than other galaxies. (A) Both are rich in galaxies.
(C) They are not actually galaxies but (B) Both emit X rays.
parts of galaxies. (C) Both are part of the same
supercluster
(D) They are outnumbered by galaxies (D) Both are small clusters.
that do occur in clusters.
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