NGC891, also known as the Silver Sliver Galaxy and the Outer Limits Galaxy, is a Type SA(s)b edge-on unbarred spiral 30 million light-years from Earth in constellation Andromeda and its diameter is 130,462 light-years. NGC891’s apparent magnitude is 10.8 and was discovered by William Hershel in 1784.

NGC891 reveals its thick plane of dust and interstellar gas. While initially thought to look like our own Milky Way if seen from the side, more detailed surveys revealed the existence of filaments of dust and gas escaping the plane of the galaxy into the halo over hundreds of light-years. They can be clearly seen here against the bright background of the galaxy halo, expanding into space from the disk of the galaxy.  Astronomers believe these filaments to be the result of the ejection of material due to supernovae or intense stellar formation activity.

The list below exhibits the number of subframes used with the exposure time for each filter. All the subframes were calibrated with Flats, Darks and Biases by PixInsight. Afterwards the subframes were combined and processed to the final image.

^* 2×2 binned

Total time for collecting data for this image is 11.8 hours.