NASA’s Chandra X-ray Observatory has completed the deepest X-ray image ever obtained, made with over 7 million seconds of observing time revealing the best picture ever at the growth of black holes over billions of years beginning soon after the Big Bang. The central region of the image contains the highest concentration of supermassive black holes ever seen, equivalent to about 5,000 objects that would fit into the area of the full Moon and about a billion over the entire sky.
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