In July 2025, the scientific community was stunned by groundbreaking news — the international collaboration of LIGO, Virgo, and KAGRA detectors recorded the most powerful gravitational signal ever observed. This event is significant not only in terms of astrophysics but also as a challenge to existing theories of black hole formation. The gravitational waves detected in this instance indicated a merger of two extremely massive black holes — one around 140 solar masses, the other about 100. The result was a supermassive black hole with a final mass exceeding 225 solar masses. This figure significantly exceeds the bounds predicted by many theoretical models, casting doubt on current ideas about the mass limits of stellar-collapse remnants. Until now, it was believed that the range of 60 to 130 solar masses represented a 'forbidden window' for black hole formation — objects in this range, according to theory, cannot form from a single stellar collapse. This is due to the instability of stars of such mass and the predicted pair-instability supernova effect, where the star explodes leaving no remnant. However, the detected merger shows that such massive black holes not only exist but can merge to create even heavier entities. This discovery opens numerous new directions for research. First and foremost is the question: how could such massive black holes form? Possible hypotheses include mergers of smaller black holes in dense stellar clusters and alternative stellar evolution models. The role of the early Universe and primordial black holes is also under discussion. LIGO in the USA, Virgo in Italy, and KAGRA in Japan continue their joint monitoring of gravitational waves. Such events are becoming more frequent as equipment sensitivity improves. This means that humanity may soon peer even deeper into the structure of the cosmos and uncover mysteries long beyond our understanding. This observation also provides an opportunity to test Einstein’s General Theory of Relativity under extreme conditions. Analysis of the signal showed no significant deviations from theoretical predictions, reinforcing the theory’s robustness. However, as more such events are recorded, unexpected discoveries could arise — such as traces of new particles or anomalies pointing to physics beyond the Standard Model. Thus, the record-breaking gravitational event of July 2025 is not only a scientific sensation but a milestone in understanding our Universe. It prompts a reassessment of current models and opens new research horizons. Sources: The biggest black hole smashup ever detected challenges physics theories – Science News (https://www.sciencenews.org/article/biggest-black-hole-gravitational-waves?utm_source=chatgpt.com), NASA confirms 3I/ATLAS as third interstellar object passing through our solar system – Times of India (https://timesofindia.indiatimes.com/science/nasa-confirms-3i/atlas-as-third-interstellar-object-passing-through-our-solar-system/articleshow/122431184.cms?utm_source=chatgpt.com), LIGO Scientific Collaboration – Gravitational Wave Observations (https://www.ligo.caltech.edu), KAGRA gravitational wave observatory – ICRR, Japan (https://gwcenter.icrr.u-tokyo.ac.jp/en/), Virgo Interferometer – European Gravitational Observatory (https://www.virgo-gw.eu)