Sh2-170, famously nicknamed the Little Rosette Nebula, is a beautiful and compact emission nebula located approximately 7,500 light-years away in the constellation Cassiopeia. It is part of the Perseus Arm of the Milky Way and earned its name due to its striking structural resemblance to the much larger and more famous Rosette Nebula in Monoceros. The nebula is primarily energized by the massive, hot O-type star BD+63 2093 (also known as LS I +64 11), which sits at its core and provides the intense ultraviolet radiation required to ionize the surrounding hydrogen gas. Sh2-170 is physically associated with the young open star cluster Stock 18, which contains roughly 70 variable stars and numerous young stellar objects. In wide-field astrophotography, Sh2-170 is often captured as the small “dot” at the bottom of the much larger Question Mark Nebula complex, although it is actually located much further away than the neighboring NGC 7822.  Written by Gemini AI.