The Bubble Nebula, NGC 7635 (SH162/Caldwell 11)
This is what's known as a Wolf-Rayet star, a young, massive and extremely hot star that's burning its fuel rapidly and is approaching the supernova stage.
It's thought to be between 10 and 40 times as massive as the sun. It's
the bright star in the bubble, but isn't at the centre of the bubble due
to the different densities of the surrounding material.
A second, larger bubble can be seen in this image, the edge of which
is next to the bright blue star in the lower right.
Click on image below for full size version
Telescope. 12 inch custom Ritchey Chretien @ F5.3
Camera. Atik 460EX using Baader filters
H-Alpha. 32 x 10 minutes
OIII. 18 X 10 minutes
RGB, all 3 minutes each, 12 red, 12 green & 25 blue.
Imaged in January and February 2013 from Dorset, England.
Meade LX200GPS 14" @ F6.3
30 x 6 minute Ha
Imaged on 30thAugust 2008.