Arp 147 contains the remnant of a spiral galaxy (right) that collided with the elliptical galaxy on the left, producing an expanding wave of star formation that shows up as a blue ring containing in abundance of massive young stars. These stars race through their evolution in a few million years or less and explode as supernovas, leaving behind neutron stars and black holes. A fraction of the neutron stars and black holes will have companion stars, and become bright X-ray sources as they pull in matter from their companions. The nine brilliant X-ray sources scattered around the ring...
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