This expansive three-panel mosaic captures a rarely imaged region in the constellation Camelopardalis, featuring the supernova remnant G150.3+4.5—also known as “Thor’s Lightning”—alongside the faint emission nebulae MarSai 1 and Sharpless 204, 207, 208, and 210. Supernova remnant G150.3+4.5 is an ancient, diffuse structure, believed to be the remnants of a stellar explosion that occurred tens of thousands of years ago. Its faint filaments and ionized gas are difficult to detect, requiring long integration times and specialized narrowband filters to reveal its expanding shock fronts.

MarSai 1, a relatively newly cataloged nebula, adds to the complexity of the scene, while the Sharpless objects contribute a rich interplay of ionized hydrogen (Hα) emissions, sculpted by stellar winds and radiation from young, massive stars. Captured from the dark skies of Deep Sky West, this deep exposure highlights the intricate structure and faint details of these rarely studied objects, providing valuable insight into the late-stage evolution of massive stars and the impact of supernovae on the interstellar medium.