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Explanation: Old photographs show no evidence of the above nebula. In 1992, a white dwarf star in Cygnus blew off its outer layers in a classical nova explosion: an event called Nova Cygni 1992. Light flooded the local interstellar neighborhood, illuminated this existing gas cloud, excited the existing hydrogen, and hence caused the red emission. The only gas actually expelled by the nova can be seen as a small red ball just above the photograph's center. Eventually, light from the nova shell will fade, and this nebula will again become invisible!
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NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day
Publications with keywords: nebula - nova
Publications with words: nebula - nova
See also:
- APOD: 2025 July 22 B A Double Detonation Supernova
- APOD: 2025 July 3 B Nova V462 Lupi Now Visible
- APOD: 2025 March 18 B LDN 1235: The Shark Nebula
- APOD: 2024 June 11 B Colorful Stars and Clouds near Rho Ophiuchi
- APOD: 2024 January 23 B Deep Nebulas: From Seagull to California
- APOD: 2023 June 14 B The Shark Nebula
- NGC 7380: The Wizard Nebula