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.
1 First astronaut: Robert H. Lawrence, Jr., 1967, was the first black astronaut, but he died in a plane crash during a training flight and never made it into space. 2  Guion Bluford, 1983, became the first black astronaut to travel in space; Mae Jemison, 1992, became the first black female astronaut.