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| Figure 1 | Figure 2 |
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.
Figure 2 is similar to Figure 1 except the color blue represents X-ray light captured by
NASA's Chandra X-ray Observatory. The colliding galaxies appear white in this picture
because they are in areas where all the colors overlap.
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.
