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Why is M19 considered an unusually shaped globular cluster?

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Dense cluster of thousands of stars forming a bright, spherical shape in the night sky, representing globular cluster M13. — Globular cluster Globular cluster M13.

M19 is considered an unusually shaped globular cluster because it is the most elliptical cluster known. While most globular clusters appear circular and are likely spherical, M19 exhibits a distinct elongation, with its major axis measuring approximately double the length of its minor axis.12