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Keyword: HII region
![Водород в галактике М51](https://images.astronet.ru/pubd/2010/06/25/0001245678/M51_peris900r.preview.jpg)
11.06.2010
Perhaps the original spiral nebula, M51 is a large galaxy, over 60,000 light-years across, with a readily apparent spiral structure. Also cataloged as NGC 5194, M51 is a part of a well-known interacting galaxy pair, its spiral arms and dust lanes clearly sweeping in front of companion galaxy NGC 5195 (top).
![SH2 155: туманность Пещера](https://images.astronet.ru/pubd/2014/11/06/0001325200/C9CaveNebulaSHOSnyder1024.preview.jpg)
5.11.2014
This colorful skyscape features the dusty Sharpless catalog emission region Sh2-155, the Cave Nebula. In the composite image, data taken through narrowband filters tracks the glow of ionized sulfur, hydrogen, and oxygen atoms in red, green, and blue hues.
![Sh2 155: туманность Пещера](https://images.astronet.ru/pubd/2013/10/21/0001294811/CaveFinalWalker950c.preview.jpg)
19.10.2013
This colorful skyscape features the dusty, reddish glow of Sharpless catalog emission region Sh2-155, the Cave Nebula. About 2,400 light-years away, the scene lies along the plane of our Milky Way Galaxy toward the royal northern constellation of Cepheus.
![Игра в "скорлупки" в NGC 300](https://images.astronet.ru/pubd/2002/08/22/0001179043/ngc300h_eso.preview.jpg)
22.08.2002
Featured in color in yesterday's episode, big, beautiful, face-on spiral galaxy NGC 300 is seen here through a narrow filter that transmits only the red light of hydrogen atoms. Ionized by energetic starlight, a hydrogen atom emits the characteristic red H-alpha light as its single electron is recaptured and transitions to lower energy states.
![IC 1396 крупным планом](https://images.astronet.ru/pubd/2005/09/30/0001208268/ic1396b_wright_f13.preview.jpg)
30.09.2005
Clouds of glowing hydrogen gas mingle ominously with dark dust lanes in this close-up of IC 1396, an active star forming region some 2,000 light years away in the constellation Cepheus. In this and other similar emission nebulae, energetic ultraviolet light from a hot young star strips electrons from the surrounding hydrogen atoms.
![Туманность Пузырь крупным планом](https://images.astronet.ru/pubd/2004/08/13/0001199145/ngc7635_hst.preview.jpg)
17.11.1998
It's the bubble versus the cloud. NGC 7635, the Bubble Nebula, is being pushed out by the stellar wind of massive central star BD+602522. Next door, though, lives a giant molecular cloud, visible above to the upper left.
![NGC 7635: туманность Пузырь](https://images.astronet.ru/pubd/2004/08/13/0001199143/ngc7635_pt_big.preview.jpg)
16.11.1998
What created this huge space bubble? A massive star that is not only bright and blue, but also emitting a fast stellar wind of ionized gas. The Bubble Nebula is actually the smallest...
![Игра в "скорлупки" в БМО](https://images.astronet.ru/pubd/2006/05/18/0001214159/lmc_gleason_f23.preview.jpg)
18.05.2006
An alluring sight in dark southern skies, the Large Magellanic Cloud (LMC) is seen here through a narrow filter that transmits only the red light of hydrogen atoms. Ionized by energetic starlight, a hydrogen atom emits the characteristic red H-alpha light as its single electron is recaptured and transitions to lower energy states.
![Активное звездное скопление NGC 3603](https://images.astronet.ru/pubd/2006/11/12/0001217682/ngc3603_vlt_big.preview.jpg)
18.10.1999
NGC 3603 is home to a massive star cluster, thick dust pillars, and a star about to explode. The central open cluster contains about 2000 bright stars, each of which is much brighter and more massive than our Sun.
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