Quad Galaxy Collision
One of the biggest galaxy collisions ever observed is taking place at the centre of this image from Spitzer.
The four white blobs in the middle are large galaxies that have begun to tangle and ultimately merge into a single gargantuan galaxy.
The whitish cloud around the colliding galaxies contains billions of stars tossed out during the messy encounter. Other galaxies and stars appear in yellow, orange and red hues. Blue shows hot gas that permeates this distant region of tightly packed galaxies.
NASA's Spitzer Space Telescope serendipitously spotted the quadruple merger during a routine survey of a distant galaxy cluster, called CL0958+4702, located nearly 5 billion light years away.
Spitzer's infrared eyes observed an unusually large fan-shaped plume of light emerging from a gathering of four elliptical galaxies. Three of the galaxies are about the size of the Milky Way, while the fourth is three times as large.
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