Credit: NASA/JPL-Caltech/K. Rines (Harvard-Smithsonian CfA)

Fearsome Foursome

One of the biggest galaxy collisions ever observed is taking place at the center of this image. The four yellow blobs in the middle are large galaxies that have begun to tangle and ultimately merge into a single gargantuan galaxy. The yellowish cloud around the colliding galaxies contains billions of stars tossed out during the messy encounter. Other galaxies and stars appear in yellow and orange hues.

NASA's Spitzer Space Telescope spotted the four-way collision, or merger, in a giant cluster of galaxies, called CL0958+4702, located nearly five billion light-years away. The dots in the picture are a combination of galaxies in the cluster; background galaxies located behind the cluster; and foreground stars in our own Milky Way galaxy.

Infrared data from Spitzer are colored red in this picture, while visible-light data from a telescope known as WIYN are green. Areas where green and red overlap appear orange or yellow. Since most galaxies in the cluster contain old stars that are visible to Spitzer and WIYN, those galaxies appear orange.

The WIYN telescope, located near Tucson, Ariz., is owned and operated by the WIYN Consortium, which consists of the University of Wisconsin, Indiana University, Yale University, and the National Optical Astronomy Observatory.

About the Object	Object Name: CL 0958+4702 Object Type: Interacting Galaxies; Cluster of Galaxies Position (J2000): RA: 09h58m19.4s Dec: +47d02m00s Distance: 5 billion light-years Constellation: Ursa Major
About the Data	Image Credit: NASA/JPL-Caltech/K. Rines (Harvard-Smithsonian CfA) Instrument: Spitzer/IRAC, Chandra/ACIS, WIYN/OPTIC Wavelength: 3.6 micron (red), visible (green) Exposure Date: May 2, 2006 (Spitzer) Exposure Time: 1200 sec (Spitzer) Field of View: 5.3 x 5.3 arcmin Orientation: North is up Release Date: 2007-08-06
Observers	K. Rines (Harvard-Smithsonian Center for Astrophysics) R. Finn (Siena College) A. Vikhlinin (Harvard-Smithsonian Center for Astrophysics)

Individual Images

Image without packaging. Screen-Resolution (450x450): JPEG High-Resolution (690x690): JPEG | Mac TIFF | PC TIFF Credit: NASA/JPL-Caltech/K. Rines (Harvard-Smithsonian CfA)

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