[nĕb́yə-lə]
(n.)A diffuse mass of interstellar dust or gas or both, visible as…
(n.)A cloudy spot on the cornea.
(n.)A liquid medication applied by spraying.
Dictionary.com · The American Heritage® Dictionary · See all 3 definitions »
Nebula - Wikipedia, the free encyclopedia
Source
A nebula (from Latin: "cloud" ; pl. nebulae or nebulæ , with ligature or nebulas ) is an interstellar cloud of dust, hydrogen gas, helium gas and plasma. Originally nebula was a general n...
en.wikipedia.org/wiki/Nebula
Nebulae are huge, diffuse clouds of gas and dust in intergalactic space. The gas in nebulae (the plural of nebula) is mostly hydrogen. ... The gas in nebulae (the plural of nebula) is mostly hydrogen gas (H2). STELLAR NURSERY; A stellar nursery is a nebula ( a large cloud of hydrogen gas in space) in which star formation...
www.enchantedlearning.com/subjects/astronomy/stars/nebu... www.enchantedlearning.com/subjects/astronomy/stars/nebulae.shtml
Diffuse nebulae are clouds of interstellar matter, namely thin but widespread agglomerations of gas and dust. If they are large and massive enough they are frequently places of star formation, thus generating big associations or clusters of stars.
www.seds.org/messier/nebula.html www.seds.org/messier/nebula.html
William Herschel classified 79 of his objects as planetary nebulae, but only 20 of them actually are of this type, together with 13 others which he had classified differently, bringing his total to 33 to 1794. The next couple of discoveries was made in the 1820s, when Karl Ludwig Harding and William Herschel's son...
www.seds.org/messier/planetar.html
Planetary nebula - Wikipedia, the free encyclopedia
Source
A planetary nebula is an emission nebula consisting of an expanding glowing shell of ionized gas and plasma ejected during the asymptotic giant branch (AGB) phase of certain types of stars late in t...
en.wikipedia.org/wiki/Planetary_nebula
Search all of HubbleSite ... THE FUTURE: WEBB TELESCOPE ... Search Picture Album...
hubblesite.org/gallery/album/nebula/ hubblesite.org/gallery/album/nebula/
New Orion Deepfield ... Heart of Orion ... The Horsehead Nebula...
www.robgendlerastropics.com/Nebulas.html www.robgendlerastropics.com/Nebulas.html
Planetary Nebulae ... The densities of these nebulae are typically 1.0E8 - 1.0E10 particles per meter3 and the expansion speed is about 20 - 30 km/s. After approximately 10,000 to 50,000 years (a short time, astronomically!) the density becomes too small for the nebula to be seen.
fusedweb.llnl.gov/CPEP/Chart_Pages/5.Plasmas/Nebula/Pla... fusedweb.llnl.gov/CPEP/Chart_Pages/5.Plasmas/Nebula/Planetary.html
Q&A
1,548 questions about
Nebulae