Synopsis
MPEG This sequence demonstrates how X-rays are needed to find black holes. Beginning with the Chandra Deep Field North, the view zooms into an X-ray close-up of a black hole over 10 billion light years away. When it dissolves into an optical image, the host galaxy is clearly bright in the center indicating the presence of a growing black hole. On the other hand, a relatively nearby black hole is bright in X-ray light, but an optical image looks like a "normal" spiral galaxy. Therefore, this black hole would have been missed without the X-ray information.
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- NASA