This image shows a colliding pair of galaxy clusters known together as the Bullet Cluster. The blue region represents a map of the cluster's dark matter. How was this blue map made?
A) The blue region was inferred from studies of how the cluster causes gravitational lensing of objects located behind it.
B) The blue region represents X-ray emission from hot gas within the cluster.
C) The blue region represents previously unknown radio emission from the dark matter.
D) The blue region comes from the combined light of many young stars drawn together by the cluster's dark matter.
A) The blue region was inferred from studies of how the cluster causes gravitational lensing of objects located behind it.
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