black hole

Black hole  is a place in space time of nearly ∞ density . It  is created after the supernova of a very big star . It has  a diameter of 20 kms but it can destroy  whole galaxies due to its gravity .It completely stops  time . It converts matter in taken  to hard x rays ,γ rays and light on its poles . The mass of a black hole increases up to nearly 1440 solar masses  after that, it turns in to a neutron star and remaining matter is converted in to hawking’s radiation.