Search for "Planetary nebulae" in article titles:

1. Planetary nebulae: Planetary nebulae are astronomical objects made up primarily of gaseous materials. They are extended in size and fuzzy in appearance, and generally show some degree of symmetry. [100%] 2021-12-24 [Astrophysics] [Space Science]...
2. List of planetary nebulae: The following is an incomplete list of known planetary nebulae. (None) [70%] 2023-12-13 [Planetary nebulae] [Lists of nebulae]...
3. List of planetary nebulae: The following is an incomplete list of known planetary nebulae. (None) [70%] 2023-12-13 [Planetary nebulae] [Lists of nebulae]...
4. Abell Catalog of Planetary Nebulae: The Abell Catalog of Planetary Nebulae was created in 1966 by George O. Abell and was composed of 86 entries thought to be planetary nebulae that were collected from discoveries, about half by Albert George Wilson and the rest by ... (Astronomy) [63%] 2023-12-22 [Astronomical catalogues] [Abell planetary nebulae]...