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...I are found in [[diffuse nebula|diffuse]] and [[planetary nebula|planetary nebulae]]. Consequently, narrow [[Dichroic filter|band-pass filter]]s that isolate ...ne]]s were first discovered in the spectra of [[planetary nebula|planetary nebulae]] in the 1860s. At that time, they were thought to be due to a new element ...

The diffuse Cone Nebula, so named because of its apparent shape, lies in the southern p [[Category:Dark nebulae]] ...

...bulae'' which presented a catalog, now known as the [[Gum catalog]], of 85 nebulae or nebular complexes. Gum 12, a large area of nebulosity in the direction o ...

* [http://www.darkatmospheres.com/astro/gallery/nebulae/enlarge.php?fileBase=nebulae_2 Dark Atmospheres Photography – Iris Nebula [[Category:Reflection nebulae]] ...

..., variable, and planetary nebulae is the illuminating star or stars, radio nebulae apparently derive their luminosity from collisions with the surrounding int ...

...tudy of diffuse southern H-alpha nebulae'' which presented a catalog of 84 nebulae or nebular complexes. Similar catalogs include the [[Sharpless catalog]] an *[[Gum 70a, Gum 70b, HD 100546 Nebulae]] ...

{{Diffuse nebula * [http://annesastronomynews.com/photo-gallery-ii/nebulae-clouds/the-ghost-nebula-by-adam-block/ AAN] ...

*[[List of largest nebulae]] [[Category:Diffuse nebulae]] ...

...w variable stars.<ref name="terzan"/> Terzan also discovered 158 [[diffuse nebulae]], 124 [[galaxies]], and 1428 high proper motion stars.<ref name="terzan"/> ...

...is findings in 1955 in a work called ''A study of diffuse southern H-alpha nebulae'' (see [[Gum catalog]]). He also published the discovery of the Gum Nebula ...e Gum Nebula. It also contains the Herbig-Haro object number 120.|Cometary Nebulae 30, 31 and 38 in the Gum Nebula. It also contains [[HH 120]]. ...

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...the [[Andromeda Galaxy]], M31, and evaded detection for so long due to its diffuse nature. The galaxy was finally discovered by measuring the [[redshift]]s o | title = A deep kinematic survey of planetary nebulae in the Andromeda galaxy using the Planetary Nebula Spectrograph ...

...<ref name="vanLeeuwen2007" /> The star is embedded in, or adjacent to, the diffuse nebulous cloud '''IC 4605''' located in the western regions of the [[Rho Op ...in the IC 4605 reflection nebula, one of a collection of diffuse and dark nebulae in the [[Rho Ophiuchi cloud complex]].]]22 Scorpii is a [[B-type main-seque ...

...paper, ''An Application of the Quantum Theory to the Luminosity of Diffuse Nebulae'', which for the first time provided a quantitative method (the "[[Zanstra ...

| caption = Barnard's Loop can be seen on this image as a diffuse red semicircle. ...the dark [[Horsehead Nebula|Horsehead]] and bright [[Orion Nebula|Orion]] nebulae. The loop takes the form of a large [[Arc (geometry)|arc]] centered approx ...

| type2 = diffuse ...name="Gaia DR2"/><ref name="ESO2002"/> It is one of the most identifiable nebulae because of its resemblance to a [[horse|horse's head]].<ref name="noao.edu" ...

...between permanent and [[transient astronomical event|transient]] visually diffuse [[astronomical object|objects in the sky]]. ...>{{cite book |first1=Kenneth Glyn |last1=Jones |year=1991 |title=Messier's nebulae and star clusters |issue=2 |series=Practical astronomy handbook series |edi ...

[[Category:Diffuse nebulae]] [[Category:Reflection nebulae]] ...

...[[amateur astronomer]], pioneering the field of [[astrophotography]] of [[nebulae]]. He was a member of the [[Liverpool Astronomical Society]] in England and ...e-Isaac Roberts for the encouragement of the study of the wide and diffuse nebulae of [[William Herschel]], the obscure objects of [[Edward Emerson Barnard|Ba ...

...scribed by him as "pretty bright, extremely large, irregularly round, very diffuse."<ref name=omeara2007/> ...ludes the neighboring regions of star clusters, dust clouds and reflection nebulae. This latter region includes the open clusters [[NGC 2335]] and [[NGC 2343] ...