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File:Clusters Within Clusters - Coma Cluster.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	11:35, 11 July 2022		18,281 × 10,283 (41.45 MB)	Don-vip	full-res
	10:24, 3 December 2018		4,000 × 2,250 (1.22 MB)	Jmencisom	User created page with UploadWizard

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11:35, 11 July 2022

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Credit/Provider	NASA, ESA, J. Mack, and J. Madrid et al.
Source	ESA/Hubble
Short title	Clusters within clusters
Image title	This image, from the NASA/ESA Hubble Space Telescope’s Advanced Camera for Surveys (ACS), reveals thousands of globular clusters lying at the core of a galaxy cluster. It was created by a Hubble survey that drew on data from three of the telescope’s separate observing programmes to explore the centre of the Coma cluster, a huge gathering of over1000 galaxies, about 320 million light-years away, all bound together by gravity. Astronomers spotted over 22 000 globular clusters, some of which had formed a bridge connecting a pair of well-known interacting galaxies (NGC 4889 and NGC 4874). A globular cluster is a spherical group of stars that usually orbits a galaxy as a self-contained satellite. However, the globular clusters studied here are of a different type, intracluster globular clusters. Specifically, these are globular clusters that are not bound to an individual galaxy, but to a galaxy cluster — in this case, Coma. While globular clusters orbiting our Milky Way reveal themselves as sparkling spherical assemblies of densely packed stars, at the distance of the Comla cluster, they only appear as tiny dots of light, even to Hubble's advanced vision. However, a characteristic feature of globular clusters is their colour; since the stars in any given cluster all formed at around the same time and from the same “stuff”, they usually have a consistent colour. In this way, the astronomers were able to identify the clusters — and rule out background galaxies lying in the same region of sky — by analysing their colour and size, painting a beautiful family portrait of Coma and its clusters. With the help of the identified globular clusters astronomers can map the distribution of matter and — even more important — of dark matter in the Coma cluster. The Coma Cluster was one of the first places where observedgravitational anomalies indicated the existence of dark matter. Links Science paper STScI press release
Usage terms	Creative Commons Attribution 4.0 International License
Date and time of data generation	06:00, 3 December 2018
Software used	Adobe Photoshop CC 2018 (Macintosh)
File change date and time	09:28, 26 November 2018
Date and time of digitizing	10:31, 1 November 2018
Date metadata was last modified	10:28, 26 November 2018
Unique ID of original document	xmp.did:667e215a-da98-4298-9d94-44d376d9c237
Keywords	Coma Cluster
Contact information	http://www.spacetelescope.org Karl-Schwarzschild-Strasse 2 Garching bei München, None, D-85748 Germany
IIM version	4

File:Clusters Within Clusters - Coma Cluster.jpg

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