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Like great friends, galaxies stick together. Astronomers using NASA's Spitzer Space Telescope have spotted a handful of great galactic pals bonding back when the universe was a mere 4.6 billion years old. The universe is believed to be 13.7 billion years old.

Collectively, these great galactic buddies are called galaxy clusters. A typical galaxy cluster can contain hundreds of galaxies and trillions of stars.

In this false-color composite, some of the oldest galaxy clusters in the universe pose for Spitzer's Infrared Array Camera. The individual galaxies that make up the distant clusters are shown as red dots in all four images.

The green blobs are Milky Way stars along the line of sight, and the blue specks are faint galaxies at various distances along the line of sight. The green and blue data are from a visible-light, ground-based telescope.

The cluster at 9.1 billion light-years away (lower right panel) is currently the most distant galaxy cluster ever detected.

These images are three-color composites, in which blue represents visible light with a wavelength of 0.4 microns, and green indicates visible light of 0.8 microns. The visible data were captured by the ground-based Mosaic-1 camera at the Kitt Peak National Observatory in Tucson, Ariz. Red represents infrared light of 4.5 microns, captured by Spitzer's infrared array camera.

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Beskrivning Great Galactic Buddies
Datum January 10 - 14, 2004
Källa http://gallery.spitzer.caltech.edu/Imagegallery/image.php?image_name=sig06-006
Skapare NASA/JPL-Caltech/S.A. Stanford (UC Davis/LLNL)
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http://www.spitzer.caltech.edu/Media/mediaimages/copyright.shtml

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see http://gallery.spitzer.caltech.edu/Imagegallery/image.php?image_name=sig06-006 High quality tif files also avaliable.

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Public domain Denna fil är allmän egendom eftersom den skapades av NASA. NASA:s upphovsrättspolicy hävdar att "material från NASA inte är upphovsrättsskyddad om inte annat anges". (Se Template:PD-USGov, NASA:s upphovsrättspolicy eller JPL-bildanvändningspolicy.)
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nuvarande11 juli 2007 kl. 20.58Miniatyrbild för versionen från den 11 juli 2007 kl. 20.582 400 × 2 700 (4,39 Mbyte)Anzibanonzi==Summary== Like great friends, galaxies stick together. Astronomers using NASA's Spitzer Space Telescope have spotted a handful of great galactic pals bonding back when the universe was a mere 4.6 billion years old. The universe is believed to be 13.7 bi

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