File:A distinctly disorganised dwarf.jpg

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描述A distinctly disorganised dwarf.jpg	English: Despite being less famous than their elliptical and spiral galactic cousins, irregular dwarf galaxies, such as the one captured in this NASA/ESA Hubble Space Telescope image, are actually one of the most common types of galaxy in the Universe. Known as UGC 4459, this dwarf galaxy is located approximately 11 million light-years away in the constellation of Ursa Major (The Great Bear), a constellation that is also home to the Pinwheel Galaxy (M101), the Owl Nebula (M97), Messier 81, Messier 82 and several other galaxies all part of the M81 group. UGC 4459’s diffused and disorganised appearance is characteristic of an irregular dwarf galaxy. Lacking a distinctive structure or shape, irregular dwarf galaxies are often chaotic in appearance, with neither a nuclear bulge — a huge, tightly packed central group of stars — nor any trace of spiral arms — regions of stars extending from the centre of the galaxy. Astronomers suspect that some irregular dwarf galaxies were once spiral or elliptical galaxies, but were later deformed by the gravitational pull of nearby objects. Rich with young blue stars and older red stars, UGC 4459 has a stellar population of several billion. Though seemingly impressive, this is small when compared to the 200 to 400 billion stars in the Milky Way! Observations with Hubble have shown that because of their low masses, star formation is very low compared to larger galaxies. Only very little of their original gas has been turned into stars. Thus, these small galaxies are interesting to study to better understand primordial environments and the star formation process.
日期	2016年3月28日, 06:00:00
来源	http://www.spacetelescope.org/images/potw1613a/
作者	ESA/Hubble & NASA Acknowledgement: Judy Schmidt (Geckzilla)

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	日期/时间	缩⁠略⁠图	大小	用户	备注
当前	2016年3月29日 (二) 08:43		1,280 × 926（431 KB）	Jmencisom	User created page with UploadWizard

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ar.wikipedia.org上的用途
- مجرة غير منتظمة
de.wikipedia.org上的用途
- PGC 24050
en.wikipedia.org上的用途
- Irregular galaxy
es.wikipedia.org上的用途
- Galaxia irregular
gl.wikipedia.org上的用途
- Galaxia irregular
my.wikipedia.org上的用途
- ပုံစံအတည်တကျမရှိ ဂလက်ဆီ
sr.wikipedia.org上的用途
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提供者	ESA/Hubble & NASA Acknowledgement: Judy Schmidt (Geckzilla)
来源	ESA/Hubble
使用条款	Creative Commons Attribution 4.0 International License
简短标题	A distinctly disorganised dwarf
图像标题	Despite being less famous than their elliptical and spiral galactic cousins, irregular dwarf galaxies, such as the one captured in this NASA/ESA Hubble Space Telescope image, are actually one of the most common types of galaxy in the Universe. Known as UGC 4459, this dwarf galaxy is located approximately 11 million light-years away in the constellation of Ursa Major (The Great Bear), a constellation that is also home to the Pinwheel Galaxy (M101), the Owl Nebula (M97), Messier 81, Messier 82 and several other galaxies all part of the M81 group. UGC 4459’s diffused and disorganised appearance is characteristic of an irregular dwarf galaxy. Lacking a distinctive structure or shape, irregular dwarf galaxies are often chaotic in appearance, with neither a nuclear bulge — a huge, tightly packed central group of stars — nor any trace of spiral arms — regions of stars extending from the centre of the galaxy. Astronomers suspect that some irregular dwarf galaxies were once spiral or elliptical galaxies, but were later deformed by the gravitational pull of nearby objects. Rich with young blue stars and older red stars, UGC 4459 has a stellar population of several billion. Though seemingly impressive, this is small when compared to the 200 to 400 billion stars in the Milky Way! Observations with Hubble have shown that because of their low masses, star formation is very low compared to larger galaxies. Only very little of their original gas has been turned into stars. Thus, these small galaxies are interesting to study to better understand primordial environments and the star formation process.
数据生成日期时间	2016年3月28日 (一) 06:00
使用软件	Adobe Photoshop CC 2014 (Windows)
著作权状况	著作权状况未设置
原始文件唯一ID	xmp.did:ddd73821-01f3-0a4d-b202-65c97b594119
联系信息	http://www.spacetelescope.org Karl-Schwarzschild-Strasse 2 Garching bei M√ºnchen, , D-85748 Germany
关键词	UGC 4459
IIM版本	4

File:A distinctly disorganised dwarf.jpg

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