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In physics, spacetime, also called the space-time continuum, is a mathematical model that fuses the three dimensions of space and the one dimension of time into a single four-dimensional continuum. Spacetime diagrams are useful in visualizing and understanding relativistic effects, such as how different observers perceive where and when events ...
Textiles can be felt or spun fibers made into yarn and subsequently netted, looped, knit or woven to make fabrics, which appeared in the Middle East during the late Stone Age. [4] From ancient times to the present day, methods of textile production have continually evolved, and the choices of textiles available have influenced how people ...
Computer data storage or digital data storage is a technology consisting of computer components and recording media that are used to retain digital data. It is a core function and fundamental component of computers. [ 1]: 15–16. The central processing unit (CPU) of a computer is what manipulates data by performing computations.
Probability theory. In probability theory and statistics, a normal distribution or Gaussian distribution is a type of continuous probability distribution for a real-valued random variable. The general form of its probability density function is The parameter is the mean or expectation of the distribution (and also its median and mode ), while ...
AIM-9 Sidewinder. The AIM-9 Sidewinder ("AIM" for "Air Intercept Missile") is a short-range air-to-air missile. Entering service with the United States Navy in 1956 and the Air Force in 1964, the AIM-9 is one of the oldest, cheapest, and most successful air-to-air missiles. [ 3] Its latest variants remain standard equipment in most Western ...
The universe is all of space and time [ a] and their contents. [ 10] It comprises all of existence, any fundamental interaction, physical process and physical constant, and therefore all forms of energy and matter, and the structures they form, from sub-atomic particles to entire galactic filaments. Space and time, according to the prevailing ...
By 5 June 2011 astronauts had made over 159 EVAs to add components to the station, totaling more than 1,000 hours in space. [87] [88] Zarya and Unity, the first two modules of the ISS, pictured in May 2000. The foundation for the ISS was laid with the launch of the Russian-built Zarya module atop a Proton rocket on 20 November 1998.
The Union of Soviet Socialist Republics[ u] ( USSR ), [ v] commonly known as the Soviet Union, [ w] was a transcontinental country that spanned much of Eurasia from 1922 to 1991. It was the largest country by area, extending across eleven time zones and sharing borders with twelve countries, and the third-most populous country.