Galaxy in the constellation Andromeda
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.
NGC 21 in Infrared
References
External links
Media related to NGC 21 at Wikimedia Commons
- Wikisky image of NGC 29