It has been believed that huge black holes are born in galaxy collisions, but a new research has now claimed that mysterious forces within the galaxies might be to blame. At the heart of all large galaxies are supermassive black holes million to billions of times the mass of the Sun. In many galaxies, including our Milky Way, the central black hole is quiet, but in others known as active galaxies, matter at the nucleus of the galaxy gives off intense radiation as it gets sucked into the core black hole. Scientists had thought that most active galactic nuclei were triggered by two galaxies merging or passing close to each other. Such titanic disturbances could drive material from a galaxy's disk toward its core. But, now an international team of scientists working on the COSMOS or Cosmological Evolution Survey experiment found that these monumental disruptions are often not to blame for activating the black holes, Live Science reported. The team observed over 600 active galaxies using the European Space Agency's XMM-Newton space observatory and the European Southern Observatory's Very Large Telescope in Chile. Their investigation allowed them to make a 3-D map showing the locations of the active galaxies. Because light takes time to travel, knowing the distance of these galaxies from Earth also helped reveal their ages.