Roger Penrose proposed a namesake "process" to extract energy from one type of these objects, and the no hair theorem states that they only have three properties: charge, mass, and angular momentum.  
Roger Penrose proposed a namesake "process" to extract energy from one type of these objects, and the no hair theorem states that they only have three properties: charge, mass, and angular momentum.  The Reissner-Nordstrom type has an internal Cauchy boundary, and other types include the Kerr-Newman variety, which is bounded by an ergosphere.  Some types are theorized to emit Hawking radiation, and they are generally classified as bodies that have size smaller than their Swartzchild radius.  Surrounded by accretion disks and bounded by event horizons, FTP, name these objects that have such a strong gravitational pull that light can't escape.
Roger Penrose proposed a namesake "process" to extract energy from one type of these objects, and the no hair theorem states that they only have three properties: charge, mass, and angular momentum.  
{Black Hole} (Accept {Kerr} or {Kerr-Newman} Black Hole before “no hair theorem”)