SPACE PHOTOS THIS WEEK: Blue Blob, San Juan Fire, More

SPACE PHOTOS THIS WEEK: Blue Blob, San Juan Fire, More
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October 22, 2009--A blue blob about 10.2 billion light-years away is actually the most distant galaxy cluster yet discovered. This recently released composite picture uses data from the Chandra X-Ray Observatory as well as optical and infrared data from other telescopes.

Galaxy clusters are the largest objects in the universe held together by gravity--this one, for example, is 190 million light-years across. Since we see the cluster at a point when the universe was just a quarter of its current age, the object should allow astronomers to better understand the early stages of the universe's evolution.
—X-ray image courtesy NASA/CXC/INAF, S.Andreon et al; optical and infrared images courtesy DSS, ESO/VLT
 
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