Here is the Bubble Nebula, which is an H II emission nebula in the constellation Cassiopeia. It lies close to the direction of the open cluster Messier 52. The "bubble" is created by the stellar wind from a massive hot, 8.7 magnitude young central star, SAO 20575. ( 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). This 4.5 hour exposure was taken over 2 nights, October 30 and November 1, 2011. A fellow astrophotographer, Jon Shallop in Minnesota, collaborated on this image remotely. I've taken some other images of this nebula in the past, but I think this rendering has the best star colors and overall quality.