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摘要

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.

File info

描述 Great Galactic Buddies
日期 January 10 - 14, 2004
來源 http://gallery.spitzer.caltech.edu/Imagegallery/image.php?image_name=sig06-006
作者 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 本作品由NASA創作,屬於公有領域。根據NASA的版權政策:“NASA的創作除非另有聲明否則不受版權保護。”(參見:Template:PD-USGov/zhNASA版權政策JPL圖像使用政策
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目前2007年7月11日 (三) 18:58於 2007年7月11日 (三) 18:58 版本的縮圖2,400 × 2,700(4.39 MB)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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