page_title: NGC 21
hierarchical_section_title: NGC 21
caption_attribution_description: Galaxy NGC 21
context_page_description: NGC 21 is a spiral galaxy in the Andromeda constellation. It was discovered by William Herschel in 1790. Lewis Swift observed it again in 1885, leading to its double listing in the New General Catalogue.
context_section_description: NGC 21 (also known as NGC 29) is a spiral galaxy in the Andromeda constellation. It was discovered by William Herschel in 1790. Lewis Swift observed it again in 1885, leading to its double listing in the New General Catalogue.
caption: NGC 21 in Infrared
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