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May 22, 2024 · Black is a color that results from the absence or complete absorption of visible light. It is an achromatic color, without hue, like white and grey. [2] . It is often used symbolically or figuratively to represent darkness. [3] .
May 17, 2024 · Black is an achromatic colour that lacks hue and is perceived when light is absent or all wavelengths are absorbed. Learn about the origin, properties, and uses of black in physics, chemistry, and art.
- Tanya Kelley
4 days ago · Black hole, cosmic body of extremely intense gravity from which nothing, not even light, can escape. It can be formed by the death of a massive star wherein its core gravitationally collapses inward upon itself, compressing to a point of zero volume and infinite density called the singularity.
- The Editors of Encyclopaedia Britannica
- A black hole is a cosmic body of extremely intense gravity from which even light cannot escape. Black holes usually cannot be observed directly, bu...
- The singularity constitutes the center of a black hole, hidden by the object’s “surface,” the event horizon. Inside the event horizon, the escape v...
- A black hole can be formed by the death of a massive star. At the end of a massive star's life, the core becomes unstable and collapses in upon its...
- One example of a black hole is can be found in Cygnus X-1, a binary X-ray system consisting of a blue supergiant and an invisible companion 14.8 ti...
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6 days ago · Black is a racialized classification of people, usually a political and skin color -based category for specific populations with a mid- to dark brown complexion.
3 days ago · Black Death, pandemic that ravaged Europe between 1347 and 1351, taking a proportionately greater toll of life than any other known epidemic or war up to that time. The Black Death is widely thought to have been the result of plague, caused by infection with the bacterium Yersinia pestis.
- The Editors of Encyclopaedia Britannica
- It is not known for certain how many people died during the Black Death. About 25 million people are estimated to have died in Europe from the plag...
- The Black Death is believed to have been the result of plague, an infectious fever caused by the bacterium Yersinia pestis. The disease was likely...
- The plague that caused the Black Death originated in China in the early to mid-1300s and spread along trade routes westward to the Mediterranean an...
- Yersinia causes three types of plague in humans: bubonic, pneumonic, and septicemic. Although there is DNA evidence that Yersinia was present in vi...
- The effects of the Black Death were many and varied. Trade suffered for a time, and wars were temporarily abandoned. Many labourers died, which dev...
- The Black Death has also been called the Great Mortality, a term derived from medieval chronicles’ use of magna mortalitas. This term, along with m...
May 10, 2024 · Nasa has released footage simulating what it's like being sucked into a black hole, a region of space with such strong gravity not even light can escape. The simulation was processed by a...
2 days ago · A black hole is a region of spacetime where gravity is so strong that nothing, including light and other electromagnetic waves, is capable of possessing enough energy to escape it. [2] Einstein 's theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.
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