The Black Hole at the Center of the Milky Way
  Mass  =  5 million solar masses  
  Radius (of inner horizon)  »  G M / c2  =  6 million km  =  10 solar radii  
  Natural timescale  »  G M / c3  =  30 seconds  

  Dimensionless accretion rate  =  30 seconds
Age of Universe
  =  10-16  
  Inflationary scale length  =  10-16  ×  Radius  =  10-4  millimeters  

  Þ   In less than 1 millimeter, the density at the inner horizon
will exponentiate to vastly greater than the Planck density.  

  Maelstrom