The Crescent Nebula is an emission nebula in the constellation Cygnus, about 5,000 light-years from Earth, discovered by William Herschel in 1792. It formed when the fast stellar wind of the Wolf-Rayet star WR 136 collided with slower-moving material the star had shed earlier as a red giant roughly 250,000 years ago, a collision that produced a shell bounded by two shock waves, one moving outward and one moving inward, the inward wave heating the older stellar wind to temperatures hot enough to emit X-rays.
Facts
Classification
Constellation CatalogueNew General Catalogue (NGC) 1 Discovery Year In the Other Atlases
In Constellation
Also in Divinity Atlas: the constellation this subject lies in.
Sources
1. Wikipedia (space and spaceflight articles)
Wikimedia Foundation
2. Wikidata: Crescent Nebula
Wikidata Q202993, class allow-list match (w-wdresolver-0926)View the Source Crescent Nebula (Wikipedia)
Crescent Nebula, Wikipedia - lead section, catalogue classification
The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth.
Crescent Nebula, Wikipedia - lead section, constellation
The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth.
In Group: Emission, Reflection and Diffuse Nebulae, Lead sentence
The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth.
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