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2 days ago · 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.
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
2 days ago · The Black unemployment rate sits at 5.6%, according to the latest federal government data, compared with an average of about 8% from 2016 to 2020 and 11% from 2000 to 2015. Black household wealth has surged, and Biden’s effort to cancel billions in student loan debt has disproportionately affected Black borrowers.
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May 25, 2024 · A black hole can be formed by the death of a massive star. When such a star has exhausted the internal thermonuclear fuels in its core at the end of its life, the core becomes unstable and gravitationally collapses inward upon itself, and the star’s outer layers are blown away. The crushing weight of constituent matter falling in from all ...
- 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...
- 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...
May 23, 2024 · 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.Not all people considered "black" have dark skin; in certain countries, often in socially based systems of racial classification in the Western world, the term "black" is used to describe persons who are perceived as dark-skinned compared to other populations.
1 day 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.
May 13, 2024 · Black History Month, monthlong commemoration of African American history and achievement that takes place each February in the United States. It was begun in 1976. Carter G. Woodson. Carter G. Woodson, c. 1910s. In February 1926 Woodson launched what would become Black History Month so as to recognize the history and achievements of Black ...
