Arp 299: Black Holes in Colliding Galaxies

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Explanation: Is only one black hole spewing high energy radiation — or two? To help find out, astronomers trained NASA’s Earth-orbiting NuSTAR and Chandra telescopes on Arp 299, the enigmatic colliding galaxies expelling the radiation.

from Pocket http://apod.nasa.gov/apod/ap161101.html
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