https://hgastro.github.io/tags/m108/Recent content in M108 on Suburban Backyard Astro SightsHugo -- gohugo.ioenhgastroblog@gmail.comhgastroblog@gmail.comAll images and content on this website © 2025 Howard GramsThu, 27 Feb 2020 00:00:00 +0000https://hgastro.github.io/posts/2020-02-27-m97-and-m108/Thu, 27 Feb 2020 00:00:00 +0000hgastroblog@gmail.comhttps://hgastro.github.io/posts/2020-02-27-m97-and-m108/<p>The Owl Nebula (also known Messier 97) is a planetary nebula located approximately 2,030 light years away in the constellation Ursa Major. When William Parsons observed the nebula in 1848, his hand-drawn illustration resembled an owl&rsquo;s head. It has been known as the Owl Nebula ever since. The nebula is approximately 8,000 years old. It is approximately circular in cross-section with a little visible internal structure. The nebula is arranged in three concentric shells, with the outermost shell being about 20–30% larger than the inner shell. The owl-like appearance of the nebula is the result of an inner shell that is not circularly symmetric, but instead forms a barrel-like structure aligned at an angle of 45° to the line of sight.</p>