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Physics & Astronomy Department

Astr110 Photography Projects, Fall 2007

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NGC 7635 - Bubble Nebula, Kathryn VanderWindt

Bubble Nebula

The original meaning of the word 'nebula' referred to any object in space that wasn't a planet or a star. After the telescope was invented however, star clusters and galaxies could be identified as such. Today the word 'nebula' refers to a cloud in space made of gas and dust, produced either when a star is formed, or when one is destroyed. Often their beautiful colours are visible to the naked eye during the night.

This particular nebula, the Bubble Nebula, is a quickly growing bubble of gas emitted from a huge star. This star is 40,000 times bigger than the sun, and can be seen in the center of the nebula. The bubble itself is not smooth because different types of gasses are colliding with one another. It is colourful because UV rays from the star are exciting the gasses making the hot gas flourece. The colour emitted corresponds to the kind of gas that the UV rays are hitting.. The nebula is 10 light years wide, 11,300 light years away, and is located near the constellation Cassiopeia.

One can also see in this picture a large, red, hydrogen cloud nebula. Because the Bubble Nebula is so close to this hydrogen nebula we can assume that the large star inside of the bubble is a product of part of the hydrogen cloud collapsing. When the bubble pushes on the surrounding cloud it could cause the cloud to collapse again and this could cause another star to form, creating a cycle.

References:
"All About Nebulas." Imaginova Corps, 2007. <http://www.space.com/nebulas/>.

Arnette, Bill. "Types of Nebulae ." Nine Planets, 1997. <http://astro.nineplanets.org/twn/types.html>

"Bubble Nebula." AstroGraphics, 2004. <http://www.astrographics.com/GalleryPrintsIndex/GP0031.htm>

"An Expanding Bubble in Space." HubbleSite: News Center, 2000. <http://hubblesite.org/news center/archive/releases/2000/04/>

Right Ascension (J2000) 20:20:42
Declination (J2000) +61:12:00
Filters used blue(B), green(V), red(R), and clear(C)
Exposure time per filter 5x60 seconds in CBVR
Date observed

November 1, 2007 (C)
November 1, 2007(BVR)