The Canada-France-Hawaii Telescope produced this stunning image of the well-known Horsehead Nebula. It is part of an enormous cloud of molecular gas and dust obscuring background light from nearby emission nebula IC 434, producing the silhouette

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Booming Crescent Nebula Shines in Skywatcher Photo

Nina Sen, SPACE.com Contributor

Date: 28 February 2012 Time: 02:43 PM ET

Multiple exposures are made to collect enough light for an image that would otherwise not be evident to the eye.
CREDIT: Ian Sharp

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The cloud of dust glimmering in this image represents the Crescent Nebula in the constellation Cygnus.

The nebula, also known as NGC 6888, lies about 5,000 light-years away in Cygnus, the swan. (A light-year is the distance light travels in one year — about 6 trillion miles or 10 trillion kilometers). The image was taken by astrophotographer Ian Sharp in September 2008.

NGC 6888 is an emission nebula formed by stellar winds colliding with the Wolf-Rayet star WR 136. Wolf-Rayet stars are very hot, massive stars that are blowing off their outer layers.

The collision between wind and star, which occurred when WR 136 entered its red giant phase, caused the shell-like structure with waves within. The star is expected to explode and become a supernova in the next million years.

Editor's note: If you have an amazing skywatching photo you'd like to share for a possible story or image gallery, please contact managing editor Tariq Malik at tmalik@space.com.

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