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First signs of a triple black hole system Astronomers have discovered possible evidence of a triple black hole system by analyzing the GW190814 event (black hole merger). The gravitational wave signal showed an anomalous acceleration, which can be explained by the presence of a third black hole around which the merging pair was rotating. The event involved objects with masses of about 2.6 and 23 solar masses, which is unusual in itself, since such a strong difference in masses does not fit into standard models of the evolution of binary systems. According to calculations by scientists from the Chinese Academy of Sciences, the acceleration was 0.0015 times the speed of light with a confidence level of about 90%, indicating the influence of another massive object. Since the first detection of gravitational waves in 2015, scientists have registered about 300 black hole mergers, some of which may have occurred as part of more complex systems. The discovery of a third object in GW190814 supports the hypothesis of hierarchical mergers, where new black holes are formed as a result of successive mergers. This discovery provides clues to the diverse scenarios of black hole interactions in the Universe and suggests that other examples of such systems may be hidden in the existing data. Future LIGO-Virgo-KAGRA observations should clarify the frequency of such rare events and expand our understanding of the mechanisms of black hole formation.