Tale of Two Black Holes
Published: January 8, 2015
The real monster black hole is revealed in this image from NASA's Nuclear Spectroscopic Telescope Array (NuSTAR) of colliding galaxies Arp 299. In the center panel, the NuSTAR high-energy X-ray data appear in various colors overlaid on a visible-light image from NASA's Hubble Space Telescope. The panel on the left shows the NuSTAR data alone, while the visible-light image is on the far right.
More information: https://www.nustar.caltech.edu/image/nustar150108a