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...an O’Donnell|epoch=[[Epoch (astronomy)#Julian years and J2000|J2000]]|type=emission|type2=[[Superbubble]]|ra={{RA|05|43|17.5}}<ref name="nebula"/>|dec={{DEC|-6 '''Henize 70''' ('''N70''') is a faint<ref name="pn" /> [[emission nebula]]<ref name="henize" /> and [[superbubble]]<ref name="apod" /><ref na ...

{{Short description|Emission nebula in the constellation Cygnus}} ...13 Jan 2013 }}</ref> also known as the '''Celestial Snow Angel''', is an [[emission nebula]] and a [[star formation]] region in the constellation [[Cygnus (con ...

...e Stars in M31 and M33. II. Luminous Blue Variables, Candidate LBVs, Fe II Emission Line Stars, and Other Supergiants |year=2014 |author-link1=Roberta M. Humph ...E STARS IN M31 AND M33. II. LUMINOUS BLUE VARIABLES, CANDIDATE LBVs, Fe II EMISSION LINE STARS, AND OTHER SUPERGIANTS |journal=The Astrophysical Journal |volum ...

...rge of electricity around a glowing wire<ref>Richardson, Owen Willans. The emission of electricity from hot bodies. Longmans, Green and Company, 1921.</ref> an ...G.W. Walker<ref>Walker, George W. "Some problems illustrating the forms of nebulae." Proceedings of the Royal Society of London. Series A, Containing Papers o ...

...ects using this technique, including [[globular clusters]] and [[planetary nebulae]]. Some of those objects were not visible at all on blue light (250–500&nbs ...blue light sensitive plate.<ref name=Maffei1968/> Its spectrum lacked any emission or absorption lines. Later it was shown to be radio-quiet as well. In 1970 ...

...Louis Emil Dreyer]], compiler of the first ''[[New General Catalogue]] of Nebulae and Clusters of Stars'', described NGC 681 as being a "pretty faint, consid ...ery high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.<ref name= ...

...ral line|line]].<ref name="Knapp"/> Later studies of millimeter-wave radio emission have detected over 20 different molecular species in the CSE. There include ...esolution [[Interferometry|interferometric]] measurements show that the CO emission lines arise from a spiral structure. The spiral structure of the molecular ...

...165|bibcode=2010A&A...511A..58D|issn=0004-6361|doi-access=free}}</ref> The nebulae of both Westerlund 1-20 and Westerlund 1 W26 are extended outward from the ...

...a]]. The array is designed to measure red-shifted 21-cm [[hydrogen line]] emission on large angular scales, in order to map out the [[baryon acoustic oscillat ...and increasing radius accounting for the radial velocity of extra-galactic nebulae ...

...4=Johnson|first4=T.|last5=Chapman|first5=J. M.|date=2010-02-01|title=Radio emission from the massive stars in the galactic super star cluster Westerlund 1|jour ...75 is surrounded by extended nebula, although it appears less massive than nebulae around typical red supergiant stars.<ref>{{cite journal |doi=10.1093/mnrasl ...

...0L|arxiv = 1403.5298|title = Nature Versus Nurture: Luminous Blue Variable Nebulae in and Near Massive Stellar Clusters at the Galactic Center|journal=The Ast ...ealed LBV G0.120-0.048 as a strong source of [[Paschen-alpha]] (Paschen-α) emission which exceeded that of the [[Pistol star]].<ref name="mauerhan"/> Therefore ...

...nal|doi=10.1046/j.1365-8711.1998.02038.x|title=Discovery of extended radio emission in the young cluster Wd1|journal=Monthly Notices of the Royal Astronomical ...<ref name=dougherty>{{cite journal|bibcode=2010A&A...511A..58D|title=Radio emission from the massive stars in the galactic super star cluster Westerlund 1|jour ...

...re soon located, in 1963, via their [[Hydrogen line|neutral hydrogen radio emission]]. They were traveling toward the galactic disk at a very high velocity rel ...man" /> For those HVCs where both are available, distances measured via Hα emission tend to agree with those found via direct distances measurements.<ref name= ...

...10| pages=L128–L132| year=2010| s2cid=117706457}}</ref> They have a strong emission line at the [OIII] [[wavelength]] of 500.7&nbsp;nm. [OIII], O⁺⁺ ...author3=T.X. Thuan |title=Green Pea Galaxies and cohorts: Luminous Compact Emission-Line Galaxies in the Sloan Digital Sky Survey |date=2011 |journal=The Astro ...

...px|Relation between proper motion and velocity components of an object. At emission, the object was at distance ''d'' from the Sun, and moved at angular rate ' ...ns. I – UBV photometry and MK spectroscopy of stars in southern reflection nebulae ...

....44A |issn=0004-637X}}</ref> Radio arrays like ALMA can also detect narrow emission from the gas of the disk. This can reveal the [[velocity]] of the gas withi [[Category:Nebulae]] ...

...Friedmann–Lemaître–Robertson–Walker metric|FLRW]] metric) from the time of emission by a galaxy to the time an observer (on Earth) receives the light signal. I ...pec.<ref name="Curtis-Lake2023"/> Most distant spectroscopic redshift from emission lines; most distant detection of non-primordial elements (C, O, Ne). ...

...e (unit)|foes]]) in total radiated as gravitational waves, reaching a peak emission rate in its final few milliseconds of about {{val|3.6|0.5|0.4}}{{e|49}} [[w ...me="Integral">{{cite journal |title=''INTEGRAL'' upper limits on gamma-ray emission associated with the gravitational wave event GW150914 |journal=[[The Astrop ...

...|last=Zwicky |first=F. |title=On the masses of nebulae and of clusters of nebulae |date=1937 |journal=[[The Astrophysical Journal]] |volume=86 |page=217 |bib ...970 |title=Rotation of the Andromeda Nebula from a spectroscopic survey of emission regions |journal=[[The Astrophysical Journal]] |volume=159 |pages=379–403 | ...

| The expected time when the net light emission from the combined "Milkomeda" galaxy begins to decline as the [[red dwarf]] ...th collides with the [[black dwarf]] Sun due to the decay of its orbit via emission of [[gravitational radiation]],<ref name="dyson" /> if the Earth is not eje ...