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Black hole

A black hole is a region in space where the gravitational pull is so strong that nothing, not even light, can escape. This phenomenon occurs when a massive star collapses under the force of its own gravity, creating a singularity, or a point of infinite density, surrounded by an event horizon, the boundary from within which escape is impossible. In Hebrew, a black hole is called חור שחור (pronounced "chor shachor"). In other languages, it is known as trou noir in French, Schwarzes Loch in German, and buco nero in Italian. Black holes are a key area of study in astrophysics, offering insights into the nature of gravity, spacetime, and the universe's most extreme conditions. They can be detected through their effects on nearby matter, such as the emission of X-rays from accretion disks or the bending of light through gravitational lensing.

Wikipedia Information
Black hole
Compact astronomical body
Black hole
A black hole is an astronomical body so compact that its gravity prevents anything from escaping, even light. Albert Einstein's theory of general relativity predicts that a sufficiently compact mass will form a black hole. The boundary of no escape is called the event horizon. In general relativity, a black hole's event horizon seals an object's fate but produces no locally detectable change when crossed. In many ways, a black hole acts like an ideal black body, as it reflects no light. 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.
Last modified: 2025-11-20T03:50:49ZView full article on Wikipedia