This artist's concept shows a warm, watery alien world in the early universe whose sky is filled with a variety of galaxies. Spitzer data showed that the early universe was a big zoo with "animals" of all sorts, including surprisingly old, dead galaxies that stopped forming stars very quickly. Credit: David A. Aguilar (CfA)
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Central region 2.5 x 2.5 arcminutes of the deep infrared Spitzer images that were analyzed in this study. The color image is a combination of images taken with IRAC at 3.6 micron (green) and 4.5 micron (red), supplemented with the deepest K-band image (blue) ever taken (Very Large Telescope). Credit: Ivo Labbé (OCIW)
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