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20 hours ago · Einstein's field equations include a cosmological constant to account for the alleged staticity of the universe. However, Edwin Hubble observed in 1929 that the universe appears to be expanding. By the 1930s, Paul Dirac developed the hypothesis that gravitation should slowly and steadily decrease over the course of the history of the universe. [108]
20 hours ago · v. t. e. Physics is the natural science of matter, involving the study of matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. [1] Physics is one of the most fundamental scientific disciplines.
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20 hours ago · Ontology. Ontology is the philosophical study of being. As one of the most fundamental concepts, being encompasses all of reality and every entity within it. To articulate the basic structure of being, ontology examines what all entities have in common and how they are divided into fundamental classes, known as categories.
20 hours ago · Phosphorus. Phosphorus is a chemical element; it has symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Earth. It has a concentration in the Earth's crust of about one gram per kilogram (compare ...
20 hours ago · Lex Luthor. Lex Luthor, as appeared on a variant cover of Action Comics #890 (June 2010). Art by David Finch. Alexander Joseph " Lex " Luthor ( / ˈluːθɔːr, - θər /) is a supervillain appearing in American comic books published by DC Comics. The character was created by Jerry Siegel and Joe Shuster. Lex Luthor originally appeared in ...
20 hours ago · t. e. The number π ( / paɪ /; spelled out as " pi ") is a mathematical constant that is the ratio of a circle 's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics.
20 hours ago · Evangelicalism (/ ˌ iː v æ n ˈ dʒ ɛ l ɪ k əl ɪ z əm, ˌ ɛ v æ n-,-ə n-/), also called evangelical Christianity or evangelical Protestantism, is a worldwide interdenominational movement within Protestant Christianity that emphasizes the centrality of sharing the "good news" of Christianity, being "born again" in which an individual experiences personal conversion, as ...
