This image shows Arp 81, a strongly interacting pair of galaxies, seen about 100 million years after their closest approach. It consists of NGC 6621, to the left, and NGC 6622, to the right. NGC 6621 is the larger of the two, and is a very disturbed spiral galaxy. The encounter has pulled a long tail out of NGC 6621 that has now wrapped behind its body. The collision triggered extensive star formation between the two.
(Photo: AP Photo/NASA/ESA)
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