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The following is an incomplete list of known planetary nebulae. Image Name Messier Catalogue [a] NGC [a] Other designation [a] Date discovered [a] Distance [a] [b]
The following articles contain lists of nebulae: List of dark nebulae; List of diffuse nebulae; List of planetary nebulae; List of protoplanetary nebulae;
Pages in category "Lists of nebulae" The following 7 pages are in this category, out of 7 total. This list may not reflect recent changes. ...
Only 36 stars were known to be in this nebula but the Chandra telescope increased the number of known stars to 160. Lagoon Nebula: 110 ly (34 pc) [44] H II region: Veil Nebula: 100–130 ly (31–40 pc) [45] Supernova remnant: Located in the Cygnus Loop: NGC 3576: 100 ly (31 pc) [46] Emission nebula: N41: 100 ly (31 pc) [47] Emission nebula ...
For example, if a TNO is incorrectly assumed to have a mass of 3.59 × 10 20 kg based on a radius of 350 km with a density of 2 g/cm 3 but is later discovered to have a radius of only 175 km with a density of 0.5 g/cm 3, its true mass would be only 1.12 × 10 19 kg.
This nebula was also observed by Johann Baptist Cysat in 1618. However, the first detailed study of the Orion Nebula was not performed until 1659 by Christiaan Huygens, who also believed he was the first person to discover this nebulosity. [11] In 1715, Edmond Halley published a list of six nebulae.
Boomerang Nebula: Centaurus Bipolar Nebula 1980 5,000 Calabash Nebula: OH231.8+4.2 1786 4,200 Egg Nebula: CRL 2688 1996 3,000 Frosty Leo Nebula: IRAS 09371+1212 1976 3,000 Red Rectangle Nebula: HD 44179 1973 2,300 ± 300 Cotton Candy Nebula: IRAS 17150-3224 Water Lily Nebula: IRAS 16594-4656 1999 IRAS 22036+5306: 6,500 Westbrook Nebula: IRAS ...
A typical planetary nebula is roughly one light year across, and consists of extremely rarefied gas, with a density generally from 100 to 10,000 particles per cm 3. [40] (The Earth's atmosphere, by comparison, contains 2.5 × 10 19 particles per cm 3.) Young planetary nebulae have the highest densities, sometimes as high as 10 6 particles per ...