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The Medusa Nebula, cataloged as Abell 21, is a planetary nebula located approximately 1,500 light-years from Earth in the direction of the Gemini constellation. It was first identified in 1955 by George O. Abell as part of his catalog of low-surface-brightness nebulae. The name "Medusa Nebula" derives from its visual resemblance to the snake-haired Gorgon Medusa from Greek mythology. However, this designation is symbolic and not used in scientific classification. Medusa Nebula. (NOIRLab) " image