File:A snowstorm of stars.jpg

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描述A snowstorm of stars.jpg	English: It’s beginning to look a lot like Christmas in this NASA/ESA Hubble Space Telescope image of a blizzard of stars, which resembles a swirling storm in a snow globe. These stars make up the globular cluster Messier 79, located about 40 000 light-years from Earth in the constellation of Lepus (The Hare). Globular clusters are gravitationally bound groupings of up to one million stars. These giant “star globes” contain some of the oldest stars in our galaxy. Messier 79 is no exception; it contains about 150 000 stars, packed into an area measuring just roughly 120 light-years across. This 11.7-billion-year-old star cluster was first discovered by French astronomer Pierre Méchain in 1780. Méchain reported the finding to his colleague Charles Messier, who included it in his catalogue of non-cometary objects: The Messier catalogue. About four years later, using a larger telescope than Messier’s, William Herschel was able to resolve the stars in Messier 79 and described it as a “globular star cluster.” In this sparkling Hubble image, Sun-like stars appear yellow-white and the reddish stars are bright giants that are in the final stages of their lives. Most of the blue stars sprinkled throughout the cluster are aging “helium-burning” stars, which have exhausted their hydrogen fuel and are now fusing helium in their cores.
日期	2017年12月18日, 06:00:00
来源	https://www.spacetelescope.org/images/potw1751a/
作者	NASA and ESA Acknowledgement: S. Djorgovski (Caltech) and F. Ferraro (University of Bologna)

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当前	2017年12月18日 (一) 15:05		1,503 × 1,002（871 KB）	Jmencisom	User created page with UploadWizard

文件用途

以下页面使用本文件：

M79 (球狀星團)

全域文件用途

以下其他wiki使用此文件：

ar.wikipedia.org上的用途
- مسييه 79
az.wikipedia.org上的用途
- NGC 1904
ca.wikipedia.org上的用途
- Messier 79
ce.wikipedia.org上的用途
- NGC 1904
cs.wikipedia.org上的用途
- Messier 79
diq.wikipedia.org上的用途
- NGC 1904
en.wikipedia.org上的用途
- Messier 79
- Melotte catalogue
eo.wikipedia.org上的用途
- M79
es.wikipedia.org上的用途
- Lepus (constelación)
et.wikipedia.org上的用途
- Messier 79
eu.wikipedia.org上的用途
- Messier sistema
- Messier 79
hu.wikipedia.org上的用途
- Messier 79
it.wikipedia.org上的用途
- Catalogo Melotte
ja.wikipedia.org上的用途
- うさぎ座
lt.wikipedia.org上的用途
- Mesjė 79
mk.wikipedia.org上的用途
- Месје 79
- Мелотов каталог
nl.wikipedia.org上的用途
- Messier 79
pl.wikipedia.org上的用途
- Messier 79
sv.wikipedia.org上的用途
- Messier 79
tt.wikipedia.org上的用途
- NGC 1904
vi.wikipedia.org上的用途
- Messier 79
www.wikidata.org上的用途
- Q14019
- Wikidata:WikiProject Art in the Christian Tradition (ACT)/Non-paintings
- Q110561981
zh-yue.wikipedia.org上的用途
- M79 (天體)

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提供者	NASA and ESA Acknowledgement: S. Djorgovski (Caltech) and F. Ferraro (University of Bologna)
来源	ESA/Hubble
简短标题	A snowstorm of stars
图像标题	It’s beginning to look a lot like Christmas in this NASA/ESA Hubble Space Telescope image of a blizzard of stars, which resembles a swirling storm in a snow globe. These stars make up the globular cluster Messier 79, located about 40 000 light-years from Earth in the constellation of Lepus (The Hare). Globular clusters are gravitationally bound groupings of up to one million stars. These giant “star globes” contain some of the oldest stars in our galaxy. Messier 79 is no exception; it contains about 150 000 stars, packed into an area measuring just roughly 120 light-years across. This 11.7-billion-year-old star cluster was first discovered by French astronomer Pierre Méchain in 1780. Méchain reported the finding to his colleague Charles Messier, who included it in his catalogue of non-cometary objects: The Messier catalogue. About four years later, using a larger telescope than Messier’s, William Herschel was able to resolve the stars in Messier 79 and described it as a “globular star cluster.” In this sparkling Hubble image, Sun-like stars appear yellow-white and the reddish stars are bright giants that are in the final stages of their lives. Most of the blue stars sprinkled throughout the cluster are aging “helium-burning” stars, which have exhausted their hydrogen fuel and are now fusing helium in their cores.
使用条款	Creative Commons Attribution 4.0 International License
数据生成日期时间	2017年12月18日 (一) 06:00
JPEG文件备注	It's beginning to look a lot like the holiday season in this NASA Hubble Space Telescope image of a blizzard of stars, which resembles a swirling snowstorm in a snow globe. The stars are residents of the globular star cluster Messier 79, or M79, located 41,000 light-years from Earth, in the constellation Lepus. The cluster is also known as NGC 1904. Globular clusters are gravitationally bound groupings of as many as 1 million stars. M79 contains about 150,000 stars packed into an area measuring only 118 light-years across. These giant "star-globes" contain some of the oldest stars in our galaxy, estimated to be 11.7 billion years old. Most globular clusters are grouped around the central hub of our pinwheel-shaped galaxy. However, M79's home is nearly on the opposite side of the sky from the direction of the galactic center. One idea for the cluster's unusual location is that its neighborhood may contain a higher-than-average density of stars, which fueled its formation. Another possibility is that M79 may have formed in an unusual dwarf galaxy that is merging with the Milky Way. In the Hubble image, Sun-like stars appear yellow. The reddish stars are bright giants that represent the final stages of a star's life. Most of the blue stars sprinkled throughout the cluster are aging "helium-burning" stars. These bright blue stars have exhausted their hydrogen fuel and are now fusing helium in their cores. A scattering of fainter blue stars are "blue stragglers." These unusual stars glow in blue light, mimicking the appearance of hot, young stars. Blue stragglers form either by the merger of stars in a binary system or by the collision of two unrelated stars in M79's crowded core. The star cluster was discovered by Pierre Méchain in 1780. Méchain reported the finding to Charles Messier, who included it in his catalog of non-cometary objects. About four years later, using a larger telescope than Messier's, William Herschel resolved the stars in M79, and described it as a "globular star cluster." The image is a combination of observations taken in 1995 and 1997 by Hubble's Wide Field Planetary Camera 2. The red, green, and blue colors used to compose the image represent a natural view of the cluster. The Hubble Space Telescope is a project of international cooperation between NASA and ESA (European Space Agency). NASA's Goddard Space Flight Center in Greenbelt, Maryland, manages the telescope. The Space Telescope Science Institute (STScI) in Baltimore, Maryland, conducts Hubble science operations. STScI is operated for NASA by the Association of Universities for Research in Astronomy, Inc., in Washington, D.C.
关键词	Messier 79
联系信息	-{R\|http://www.spacetelescope.org}- Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany
IIM版本	4

File:A snowstorm of stars.jpg

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