- Lyndon Baines Johnson (/ˈlɪndən ˈbeɪnz/; August 27, 1908 – January 22, 1973), often referred to by his initials LBJ, was an American politician who served as the 36th president of the United States from 1963 to 1969. He became president after the assassination of John F. Kennedy, under whom he had served as the 37th vice president from 1961 to 1963. A Democrat from Texas, Johnson also served as a U.S. representative and U.S. senator.
- Black hole (Wikipedia)
A black hole is a region of spacetime where gravity is so strong that nothing, including light or other electromagnetic waves, has enough energy to escape it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole. The boundary of no escape is called the event horizon. Although it has a great effect on the fate and circumstances of an object crossing it, it has no locally detectable features according to general relativity. In many ways, a black hole acts like an ideal black body, as it reflects no light. Moreover, quantum field theory in curved spacetime predicts that event horizons emit Hawking radiation, with the same spectrum as a black body of a temperature inversely proportional to its mass. This temperature is of the order of billionths of a kelvin for stellar black holes, making it essentially impossible to observe directly.
- Lyndon Baines Johnson was born on August 27, 1908, near Stonewall, Texas, in a small farmhouse on the Pedernales River.
- At approximately 3:40 P.M. Central on January 22, 1973, Johnson suffered his final heart attack in his bedroom. He managed to telephone the Secret Service agents on the ranch, who found him still holding the telephone receiver, unconscious and “appear[ing] to be dead”. They attempted resuscitation, and Johnson was airlifted in one of his planes to San Antonio International Airport, en route to Brooke Army Medical Center. However, cardiologist and Army colonel George McGranahan pronounced him dead on arrival at the airport at 4:33 P.M. Johnson was 64.