A fascinating object, the Bubble Nebula is one of the most intricate nebula from my experience. The bubble itself is a slightly different color then the surrounding H-alpha. In the densely populated region of stars, it is more of a subjective choice to de-emphasize the stars so as not to overwhelm the nebula. I chose to leave the background a little brighter to allow for the subtle dust and low-surface brightness of the surrounding region.
From Wikipedia:
The "bubble" is created by the
stellar wind from a massive hot, 8.7=reference
[1]magnitude young central
star, SAO 20575 (
BD+60°2522).=reference
[7] The nebula is near a giant
molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star, causing it to glow.=reference
[7] It was discovered in November 1787 by
William Herschel.
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