By Jim Militello | 2025-09-16
The Bubble nebula and friends
On 09/15/2025 11:00 pm by Marcy Curran | Cheyenne, Wyoming
NGC 7635, also known as the Bubble Nebula, is an emission nebula located in the constellation Cassiopeia. It is created by the stellar wind from a hot central star and is approximately 8,000 light-years away from Earth, appearing as a faint shell around the star when viewed through a telescope. To its upper left, there’s Messier 52, an open cluster of stars in the constellation of Cassiopeia. The cluster lies about 4,600 light years from Earth. And on the upper right, is NGC 7538 located in the constellation Cepheus. It is located about 9,100 light-years from Earth. It is home to the biggest (so far) known protostar that is about 300 times the size of the solar system. And it’s a region of active star formation including several luminous infrared sources. Plus, there’s several other bright and dark nebulae nearby.
Taken with a William-Optics FLT91 scope and an Ogma AP26CC Camera on a Paramount MyT mount.
This is 69 shots, 3 minutes each, stacked and processed in Pixinsight.