Bubble Nebula, a rare type of nebula, is an emission nebula in the constellation Cassiopeia. Although it looks delicate, the 7 light-year diameter bubble offers evidence of violent processes at work. Just left of the Bubble’s center is a hot, O-type star, several hundred thousand times more luminous and around 45 times more massive than the Sun. The “bubble” is created by the stellar wind from a massive hot, 8.7 magnitude young central star. It is about 9000 light years away in the outer spiral arm of our galaxy. This image is also taken in narrowband (i.e Hydrogen Alpha, Oxygen & Sulphur) and given false colors based on my discretion.
Exposure time – 12+ hours (Hydrogen Alpha – 15, Oxygen – 13 & Sulphur – 9 images of 20 minutes each).
For reference, the image in visual color that I took last year. Exposure times – 17 hours. (Luminance 17 images of 30 minutes each, 5 images each of RGB of 20 minutes each & 13 images of Hydrogen Alpha filter of 20 minutes each). Processed in Pixinsight & Photoshop Elements. Stacked in Maxim DL.