list of nebulae by type and composition - SERP Analysis

https://en.wikipedia.org/wiki/Lists_of_nebulae

https://astrobackyard.com/what-is-a-nebula/

https://en.wikipedia.org/wiki/Nebula

https://science.nasa.gov/universe/decoding-nebulae/

https://se-database.fandom.com/wiki/Category:Nebulae

https://bigthink.com/starts-with-a-bang/different-types-nebula-astronomy/

https://space-facts.com/nebulae/

https://www.celestron.com/blogs/knowledgebase/deep-sky-objects-nebulae-galaxies-star-clusters?srsltid=AfmBOoon3rS3PRADeRCSU8WseFSwZn5NDh5OjbaCFZPba0EMOc1devjv

https://forums.frontier.co.uk/threads/complete-list-of-real-nebulae-and-galaxies-in-elite.178731/

https://esahubble.org/images/archive/category/nebulae/

https://www.cloudynights.com/topic/317204-100-brightest-planetary-nebulae-spreadsheet/

https://www.britannica.com/science/nebula

https://study.com/learn/lesson/nebula-types-differences.html

https://www.space.com/nebula-definition-types

https://www.technology.org/2021/01/20/chemistry-of-nebulae/

https://astrobackyard.com/brightest-nebulae-in-the-sky/

https://www.minuteofspace.com/planetary-and-diffuse-nebulae

https://www.youtube.com/watch?v=ycBkpT7M11w&pp=ygUJI25lYnVsYWVz

http://www.messier.seds.org/planetar.html

https://science.nasa.gov/mission/hubble/science/universe-uncovered/hubble-nebulae/

https://www.cloudynights.com/topic/945609-guide-to-the-top-250-planetary-nebulae/

https://www.sciencedirect.com/science/article/pii/B9780080128351500209

https://www.astronomy.com/observing/track-down-the-25-best-planetary-nebulae-in-the-night-sky/

https://www.aanda.org/articles/aa/full_html/2011/02/aa13984-09/aa13984-09.html

https://www.astronomytrek.com/10-most-spectacular-nebulae-in-the-universe/

https://www.iceinspace.com.au/forum/archive/index.php/t-21339.html

https://www.universetoday.com/articles/what-is-a-nebula

https://astronomical.fandom.com/wiki/Nebula

https://www.frontiersin.org/journals/astronomy-and-space-sciences/articles/10.3389/fspas.2022.895287/full

https://www.skyatnightmagazine.com/space-science/beginners-guide-nebulae

https://theplanets.org/nebula-facts/

https://www.sciencedirect.com/topics/physics-and-astronomy/emission-nebulae

https://www.aanda.org/articles/aa/full_html/2010/08/aa13010-09/aa13010-09.html

https://www.livescience.com/space/25-gorgeous-nebula-photos-that-capture-the-beauty-of-the-universe

https://chandra.harvard.edu/blog/node/802

https://esahubble.org/wordbank/planetary-nebula/

https://www.astroleague.org/planetary-nebula-observing-program/

https://www.reddit.com/r/eliteexplorers/comments/7ldi61/comprised_a_list_of_most_if_not_all_nonrandom/

https://www.stsci.edu/~volk/ppn.html

https://astroforumspace.com/top-15-summer-deep-sky-objects-to-photograph-with-a-telescope/

https://www.britannica.com/science/nebula/Historical-survey-of-the-study-of-nebulae

https://www.ditl.org/nebulae-list.php?ListID=Size-charts

https://academic.oup.com/mnras/article/498/4/5367/5900158

https://www.pbs.org/video/the-5-types-of-nebulae-1bfkom/

https://www.iac.es/en/projects/physics-ionized-nebulae

https://adsabs.harvard.edu/full/1995A%26A...303..893G

https://myspacemuseum.com/list-of-nebulae

http://www.eso.org/sci/libraries/historicaldocuments/Strasbourg-ESO_catalogue/Strasbourg-ESO_Catalogue_of_Galactical_Planetary_Nebulae_Part_II.pdf

https://www.messier-objects.com/messier-catalogue/

https://archive.stsci.edu/iue/manual/atlas/part1.html

https://astropixels.com/messier/messiercat.html

https://www.mdpi.com/2075-4434/8/4/88

https://pablocarlosbudassi.com/2021/10/beautifulnebulae.html

https://www.constellation-guide.com/lagoon-nebula-messier-8/

https://www.researchgate.net/publication/386764632_The_chemical_composition_of_planetary_nebulae_and_HII_regions_in_NGC_3109

https://www.amazon.com/Planetary-Nebulae-Observe-Astronomers-Observing/dp/1461417813

http://www.seasky.org/celestial-objects/nebulae.html

https://www.astronomy.com/observing/set-your-sights-on-these-lesser-known-galaxies-clusters-and-nebulae/

https://prescottastronomyclub.org/wp-content/uploads/2022/03/Planetary-Nebulae-E.pdf

https://www.simpsonstreetfreepress.org/space-science/Nebulae

http://www.messier.seds.org/xtra/supp/cats.html

http://astroa.physics.metu.edu.tr/twn/help.html

https://www.astrosen.unam.mx/~richer/docencia/astrofisica1/pn_general_peimbert90.pdf

https://www.open.edu/openlearn/science-maths-technology/white-dwarfs-and-neutron-stars/content-section-4

https://www.astronomytrek.com/the-spookiest-nebulae-in-the-universe/

https://www.chapman.edu/

https://www.constellation-guide.com/constellation-list/cassiopeia-constellation/

https://www.nisenet.org/asteroids

https://astrophotons.com/astrophotography-targets-by-month

https://www.wikiwand.com/en/articles/nebula

https://www.eso.org/public/blog/soxs/

https://astronoo.com/en/articles/type-of-nebulae.html

https://www.researchgate.net/publication/303387592_GALEX_Observations_of_Planetary_Nebulae

https://discover.hubpages.com/education/What-is-a-Nebula

https://www.wesleyanargus.com/browse/u51LGA/2381993/hrdiagramstudentguideanswers.pdf

https://vajiramandravi.com/upsc-exam/the-universe-origin-and-its-composition/

https://www.techradar.com/news/wearables/best-smart-watches-what-s-the-best-wearable-tech-for-you-1154074

https://physics.weber.edu/palen/clearinghouse/labs/Proppn/proppn.html

https://www.wikiwand.com/en/articles/List_of_largest_nebulae

https://ncert.nic.in/textbook/pdf/kegy202.pdf

https://derekscope.co.uk/lists-of-deep-sky-objects/

https://sjcoepublicprodwest2.blob.core.windows.net/attachments/ScienceOlympiad/science_olympiad_A2/Starry%20Starry%20Night%20Nebulae%20copy.pdf

https://astroimagery.com/astrophotography/deep-space-astrophotography/brightest-deep-sky-objects/

https://www.wesleyanargus.com/default.aspx/u20LAX/2351946/monster__of_the-multiverse_5e.pdf

https://tvtropes.org/pmwiki/pmwiki.php/VideoGame/ClairObscurExpedition33