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of NGC 869 and NGC 884 (also known as h and ? Persei), but at least 10 more double clusters are known to exist. New research indicates the Cepheid-hosting M25 may constitute a ternary star cluster together with NGC 6716 and Collinder 394. Many more binary clusters are known in the Small and Large Magellanic Clouds--they are easier to detect in external systems than in our own galaxy because projection effects

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