Sergei Nayakshin of Leicester University, UK, Rashid Sunyaev and Sergey Sazonov of the Space Research Institute of Russian Academy of Sciences put forward a hypothesis, that large dust clouds that surround the supermassive black holes are composed of dust particles, that are formed from planets and asteroids. According to scientists, the black hole can capture planets and asteroids in the nearest stars and grind them when captured by the planets and asteroids, attracted by a powerful gravitational field of a black hole, faced with many similar objects, and as a result of collapse before the formation of tiny particles of dust. According to scientists, this hypothesis may finally explain- why the majority of galaxies nuclei enveloped in vast clouds of cosmic dust.