- 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.
- Buffalo, New York (Wikipedia)
Buffalo is a city in the U.S. state of New York and the county seat of Erie County. It lies in Western New York at the eastern end of Lake Erie, at the head of the Niagara River on the Canada–United States border. With a population of 278,349 according to the 2020 census, Buffalo is the second-most populous city in New York state after New York City, and the 81st-most populous city in the U.S. Buffalo and the city of Niagara Falls together make up the two-county Buffalo–Niagara Falls metropolitan area, which had an estimated population of 1.2 million in 2020, making it the 49th-largest metro area in the U.S.
