Recommended Links

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

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

https://www.universetoday.com/61103/what-is-a-nebula/#google_vignette

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

https://sciencenotes.org/nebula-definition-examples-types-facts/#google_vignette

https://nineplanets.org/questions/what-is-a-nebula/

https://www.telescopenerd.com/celestial-objects/nebula.htm

https://orbitaltoday.com/2024/09/20/what-is-a-nebula-the-cradle-and-tomb-of-the-stars/