This optical color image of galaxies is seen overlaidwith X-ray data (magenta) from NASA's black hole-hunting NuSTAR space telescope. The arrow points to magenta blobs indicating giant, supermassive ... more 
This optical color image of galaxies is seen overlaidwith X-ray data (magenta) from NASA's black hole-hunting NuSTAR space telescope. The arrow points to magenta blobs indicating giant, supermassive black holes discovered by the space telescope less 
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SPACE.com | Photo By NASA/JPL-Caltech
Wed, Sep 11, 2013 8:10 AM EDT