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Andy C. Y. Li: Orion and Running man Nebula
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Andy C. Y. Li: orion stackps
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Andy C. Y. Li: M57 ring nebula
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Andy C. Y. Li: M27 Dumbell Nebula
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Andy C. Y. Li: Running Man nebula
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Andy C. Y. Li: M42 Orion Nebula Core
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Andy C. Y. Li: Flame Nebula (NGC2024) and Horsehead Nebula (IC434)