The Bubble Nebula and surroundings

In this image, taken by +Nicolas Kizilian using a William Optics Zenithstar 66 Telescope and a Moravian G2-8300 camera, you can see a part of the sky in the constellations of Cassiopeia ( and Cepheus ( Center image you can see the Bubble Nebula (NGC 7635, Sharpless 162) an HII region ( emission nebula, about 10,000 light-years away from Earth in the aforementioned constellation of Cassiopeia.

SAO 20575 (BD+60 2522,, the central star of the nebula, is about 44 times more massive than our Sun. Gas on the star gets so hot that it escapes away into space as a "stellar wind" ( moving at over 4 million miles per hour. The star is about 4 million years old, and in 10 million to 20 million years, it will likely detonate as a supernova (

The Bubble Nebula was discovered in 1787 by the British astronomer Friedrich Wilhelm Herschel (

Also visible in this image are the open star clusters NGC 7510 ( and NGC 7654 (M52, as well as NGC 7538 (, an emission and reflection nebula and a zone of ongoing star formation ( It is home to NGC7538 S a protostar ( about about 300 times the size of the Solar System and the biggest discovered yet.

More information on the Bubble Nebula here:

What is an emission nebula?

An emission nebula is a cloud of ionized gas (often by ultraviolet radiation from nearby stars) emitting light of various colors, in case of HII mostly reddish-pink (if viewed in natural colors). More information here:

What is a reflection nebula?

A reflection nebula is a cloud of interstellar dust reflecting light from nearby stars. While those stars emit enough energy to make the dust visible they don't emit enough to ionize the gas which would then result in an emission nebula. More here:

What is an open cluster?

An open cluster is a group of up to a few thousand stars that have their origin in the same stellar nursery and are of roughly the same age. They are bound together by their gravitational forces. More information here:

Read more about the different types of nebulae here in this article I wrote for PhotographingSpace:

And in case you want to know more about colors in astrophotography, take a look here:

Image credit: The Bubble Nebula Region +Nicolas Kizilian Used with permission

If you like this image, you can find Nicolas here on G+ (+Nicolas Kizilian), on Twitter ( and on Facebook ( and see more of his work here on his website:

Thank you for your interest in this Astronomy/Astrophysics collection. Maybe add me on Google+ (+Pierre Markuse) and Twitter ( or have a look at the Space/Space Technology collection here:

#science #astronomy #astrophotograpy #emissionnebula #space #photography #ngc7635 #ngc7538 #ngc7510 #bubblenebula #m52
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