... This large circular H II (partially ionizedhydrogen gas) region is a combination of NGC 2237, NGC 2238, NGC 2239, NGC 2246 and the central star cluster of NGC 2244 (Caldwell 50).This star forming region is also known as Caldwell 49 and is located in the ...
... This ionizedHydrogen region in Cygnus is next to the star Deneb and covers a region greater then 3-degrees. ... North America (NGC 7000) and the Pelican Nebula (IC 5070) is an emission complex consisting of ionizedhydrogen gas and dust ...
... IC 1805 is a young star cluster surrounded by Ha emitting nebulosity. The hydrogen has been ionized by ultraviolet radiation from young hot stars. ...
... This large circular H II (partially ionizedhydrogen gas) region is a combination of NGC 2237, NGC 2238, NGC 2239, NGC 2246 and ... The large reddish nebula in the outer spiral arm is the HII (ionizedhydrogen) region, NGC 604. ...
... Kier first introduced the emission nebulous objects by explaining that ultraviolet emitting type O and B stars ionizehydrogen gas in their vicinity and that their recapture of the electron as it falls into a lower energy state produces the reddish glow. ...
... IC 1805 is a young star cluster surrounded by Ha emitting nebulosity. The hydrogen has been ionized by ultraviolet radiation from young hot stars. ...