Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent Nebula  ·  NGC 6888
Crescent & Soap Bubble Nebula, Maroun Mahfoud
Crescent & Soap Bubble Nebula
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Crescent & Soap Bubble Nebula

Crescent & Soap Bubble Nebula, Maroun Mahfoud
Crescent & Soap Bubble Nebula
Powered byPixInsight

Crescent & Soap Bubble Nebula

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Description

The Crescent Nebula / NGC 6888 is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000to 400,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray-emitting temperatures.  The Soap Bubble Nebula, or PN G75.5+1.7, is a planetary nebula in the constellation Cygnus.

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Crescent & Soap Bubble Nebula, Maroun Mahfoud