{"id":26599,"date":"2025-08-04T04:56:13","date_gmt":"2025-08-04T04:56:13","guid":{"rendered":"http:\/\/finn-family.com\/?p=26599"},"modified":"2025-08-04T04:56:13","modified_gmt":"2025-08-04T04:56:13","slug":"26599","status":"publish","type":"post","link":"http:\/\/finn-family.com\/?p=26599","title":{"rendered":""},"content":{"rendered":"<div><img src='https:\/\/apod.nasa.gov\/image\/2508\/M31Oxy_Collab_960.jpg' style='max-width:600px;' \/><\/p>\n<div>What are these gigantic blue arcs near the Andromeda Galaxy (M31)? Discovered in 2022 by amateur astronomers, the faint arcs &#8212; dubbed SDSO 1 &#8212; span nearly the same angular size as M31 itself. At first, their origin was a mystery: are they actually near the Andromeda Galaxy, or alternatively near to our Sun? Now, over 550 hours of combined exposure and a collaboration between amateur and professional astronomers has revealed strong evidence for their true nature: SDSO 1 is not intergalactic, but a new class of planetary nebula within our galaxy. Dubbed a Ghost Planetary Nebula (GPN), SDSO 1 is the first recognized member of a new subclass of faded planetary nebulas, along with seven others also recently identified. Shown in blue are extremely faint oxygen emission from the shock waves, while the surrounding red is a hydrogen-emitting trail that indicates the GPN&#8217;s age. via NASA <a href=\"https:\/\/apod.nasa.gov\/apod\/ap250804.html\"><\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>What are these gigantic blue arcs near the Andromeda Galaxy (M31)? Discovered in 2022 by amateur astronomers, the faint arcs &#8212; dubbed SDSO 1 &#8212; span nearly the same angular <a href=\"http:\/\/finn-family.com\/?p=26599\" class=\"more-link\">[&hellip;]<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"Layout":"","footnotes":"","_links_to":"","_links_to_target":""},"categories":[9],"tags":[10,12],"class_list":["entry","author-admin","post-26599","post","type-post","status-publish","format-standard","category-whatsup","tag-ifttt","tag-nasa"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"http:\/\/finn-family.com\/index.php?rest_route=\/wp\/v2\/posts\/26599","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/finn-family.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/finn-family.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/finn-family.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/finn-family.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=26599"}],"version-history":[{"count":1,"href":"http:\/\/finn-family.com\/index.php?rest_route=\/wp\/v2\/posts\/26599\/revisions"}],"predecessor-version":[{"id":26600,"href":"http:\/\/finn-family.com\/index.php?rest_route=\/wp\/v2\/posts\/26599\/revisions\/26600"}],"wp:attachment":[{"href":"http:\/\/finn-family.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=26599"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/finn-family.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=26599"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/finn-family.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=26599"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}