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Gravitational Two-Body Problem
The gravitational two-body problem concerns the motion of two point particles that interact only with each other, due to gravity. This means that influences from any third body are neglected. For approximate results that is often suitable. It also means that the two bodies stay clear of each other, that is, the two do not collide, and one body does not pass through the other's atmosphere. Even if they do, the theory still holds for the part of the orbit where they don't. Apart from these considerations a spherically symmetric body can be approximated by a point mass. Common examples include the parts of a spaceflight where the spacecraft is not undergoing propulsion and atmospheric effects are negligible, and a single celestial body overwhelmingly dominates the gravitational influence. Other common examples are the orbit of a moon around a planet, and of a planet around a star, and two stars orbiting each other (a binary star).
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  • 25 Nov 2022
Topic Review
SDSS J1416+1348
Coordinates: 14h 16m 24.08s, +13° 48′ 26.7″ SDSS J1416+1348 (full designation is SDSS J141624.08+134826.7) is a nearby wide binary system of two brown dwarfs, located in constellation Boötes. The system consists of L-type component A and T-type component B.
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  • 29 Nov 2022
Topic Review
Homogamy (Sociology)
Homogamy is marriage between individuals who are, in some culturally important way, similar to each other. It is a form of assortative mating. The union may be based on socioeconomic status, class, gender, ethnicity, or religion, or age in the case of the so-called age homogamy. It can also refer to the socialization customs of a particular group in that people who are similar tend to socialize with one another.
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  • 25 Nov 2022
Topic Review
Nūr (Islam)
Nūr (Arabic: النور) may refer to the "Light of God". The word "nūr" is Arabic for "heatless light", and has been passed on to many other languages. It is often used in the Quran, notably in a verse that states has been the subject of much discussion. Many classical commentators on the Quran considered that this should be taken metaphorically, as in the sense that God illuminates the world with understanding, rather than literally. The first and foremost to representatively stand to the concept of Nur Muhammad (the essence of Muhammad) being the quintessence of everything was Sayyid Abdul Qadir Gilani, who described this idea in his book Sirr ul Asrar. This concept was then preached by his disciples. One of Sayyid Abdul Qadir Gilani's disciples was the Andalusian scholar Abu Bakr ibn al-Arabi, who categorized nūr into different levels of understanding from the most profound to the most mundane. Shias believe nūr, in the sense of inner esoteric understanding, is inherited through the Imams, who in turn communicate it to the people.
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Topic Review
Superintendent (Ecclesiastical)
Superintendent is a title for the head of an administrative division in some Protestant denominations. A superintendent is one who superintends (oversees) the work of less-senior clergy. The title took the place of bishop in Northern Germany and Scandinavia after the Protestant Reformation, since bishop (from Greek: ἐπίσκοπος, romanized: epískopos, lit. overseer) was associated with Roman Catholicism. It was also used in the early days of the Church of Scotland. Later, the title was adopted to describe clerical positions in the hierarchy of Methodist churches.
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Biography
Jürgen Habermas
Jürgen Habermas (born 18 June 1929) is a German philosopher and sociologist in the tradition of critical theory and pragmatism. His work addresses communicative rationality and the public sphere. Associated with the Frankfurt School, Habermas's work focuses on the foundations of epistemology and social theory, the analysis of advanced capitalism and democracy, the rule of law in a critical soc
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  • 28 Nov 2022
Biography
Beatrice Wood
Beatrice Wood (March 3, 1893 – March 12, 1998) was an United States artist and studio potter involved in the Avant Garde movement in the United States; she founded and edited The Blind Man magazine in New York City with French artist Marcel Duchamp and writer Henri-Pierre Roché in 1917.[1] She had earlier studied art and theater in Paris, and was working in New York as an actress. She later w
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  • 25 Nov 2022
Biography
Joseph Polchinski
Joseph Gerard Polchinski Jr.[1] (May 16, 1954 – February 2, 2018) was an American theoretical physicist and string theorist.[2][3] Polchinski was born in White Plains, New York, the elder of two children to Joseph Gerard Polchinski Sr. (1929–2002),[4] a financial consultant and manager, and Joan (née Thornton), an office worker and homemaker.[5] Polchinski is primarily of Irish descent w
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  • 28 Nov 2022
Biography
Hans Adolf Krebs
Sir Hans Adolf Krebs (/krɛbz, krɛps/; 25 August 1900 – 22 November 1981)[1][2][3][4] was a German-born British biologist, physician and biochemist.[5] He was a pioneer scientist in the study of cellular respiration, a biochemical process in living cells that extracts energy from food and oxygen and makes it available to drive the processes of life.[6][7] He is best known for his discoveries
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  • 29 Nov 2022
Biography
Alfred Hübler
Alfred Wilhelm Hübler (May 16, 1957 – January 27, 2018) was a German-born research physicist at the University of Illinois at Urbana-Champaign (UIUC) Frederick Seitz Materials Research Laboratory as well as a tenured faculty member in the University of Illinois Department of Physics. He was the director of the Center for Complex Systems Research (CCSR) and an external faculty member of the Sa
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