Because of its huge mass, the cluster acts as a cosmic magnifying glass, causing light to bend around it.
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Related: cluster
Prev: If the center of NGC 4258 were a star cluster, the stars would be so closely spaced that collisions between individual stars would have long ago torn the cluster apart.
Next: All the land tortoise species formed a tight cluster of points in the upper part of the triangle; all the water turtles cluster in the lower part of the triangular graph.
