Enlarged Spleen Overview. The spleen is an important organ in the immune system. It is a bean shaped structure, located in the left upper portion of the abdominal cavity, under the diaphragm, tucked in between the 9th and 11th ribs, in the mid-back.
Chandra and NASA's Hubble Space Telescope later collected data from the event's afterglow, and together the observations led astronomers to conclude that the powerful explosions can result when a black hole and a neutron star collide, producing another black hole.
If he  is correct, it means that there is a critical point where the mass  of the black hole results in Hawking radiation emissions of a  'temperature' equal to that of the cosmic microwave background,  approximately 2.7K (you can think of this as the temperature of  space).