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  • There are 400 trillion trillion black holes in the universe

  •  Release time: 2022-01-22 Clicks: 1446  
  • Science and Technology Daily reporter Liu Xia

        How many black holes there are in the universe?This is one of the most pressing questions in modern astrophysics and cosmology,Scientists now have an answer!Scientists from the International Institute for Advanced Studies (SISSA) in Italy and other institutions wrote in the latest issue of the Astrophysical Journal,For the first time, they counted the number of stellar black holes,And calculated its distribution throughout the universe,From this, the number of black holes in the observable universe is about 400 billion billion。

      In the latest study,The scientists have well integrated the empirical formulas of SEVN, the state-of-the-art stellar and binary evolution algorithm developed by SISSA researcher Dr. Mario Spera, for the physical properties associated with galaxies (in particular, properties such as star formation rates, the number of stellar black holes, and the metal content of the interstellar medium),Developed a unique calculation method,The above conclusion is reached。

      Stellar black holes, which range in mass from a few to a few hundred solar masses, come at the end of a massive star's life, and the new study suggests that about 1% of ordinary matter in the universe is "locked" inside them。

      The researchers explained: "Properties such as the rate of star formation are important elements in defining the number and mass of stellar black holes, with the help of the new calculation method, we have obtained the number of stellar black holes and their mass distribution throughout the history of the universe, and based on this, the number of black holes in the entire observable universe.。”

      Dr Alix Cicilia, first author of the study, commented: "The innovation of the latest study is to combine detailed models of stellar and binary evolution with properties such as star formation and metal content in individual galaxies, making it the first time that scientists have calculated the number of stellar black holes and come to the most solid conclusions to date.。”

      In addition to estimating the number of black holes in the observable universe, the team worked with scientists at the University of Padua to explore various channels of formation for black holes of different masses, including isolated stars, binary star systems, and star clusters。New research shows that the most massive stellar black holes originate primarily from dynamic events in stellar clusters。

      According to the researchers, "This study covers all aspects of stellar astrophysics, galaxy formation and evolution, gravitational waves, and multi-messenger astrophysics, laying a solid foundation for further study of stellar black holes and their origins.。”