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In special relativity, just as space and time are different aspects of a more comprehensive entity called spacetime, energy and momentum are merely different aspects of a unified, four-dimensional quantity that physicists call four-momentum. In consequence, if energy is a source of gravity, momentum must be a source as well.
A science magazine is a periodical publication with news, opinions, and reports about science, generally written for a non-expert audience. In contrast, a periodical publication, usually including primary research and/or reviews, that is written by scientific experts is called a "scientific journal".
In physics, the special theory of relativity, or special relativity for short, is a scientific theory of the relationship between space and time.In Albert Einstein's 1905 paper, On the Electrodynamics of Moving Bodies, the theory is presented as being based on just two postulates: [p 1] [1] [2]
the space-time aquarium (or space-time cube), which displays individual paths in axonometric graphical projection of space and time coordinates; the space-time prism , which shows individuals' possible behavior in time-space given their capability constraints and coupling constraints;
In his 1988 book A Brief History of Time, he describes The Large Scale Structure of Space–Time as "highly technical" and unreadable for the layperson. The book, now considered a classic, has also appeared in paperback format and has been reprinted many times. a A fiftieth anniversary edition was published by Cambridge University Press in ...
General relativity is a theory of curved time and curved space. Given G as the gravitational constant, M as the mass of a Newtonian star, and orbiting bodies of insignificant mass at distance r from the star, the spacetime interval for Newtonian gravitation is one for which only the time coefficient is variable: [6]: 229–232
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Space Science Reviews is a peer-reviewed, scientific journal of space science. It was established in 1962, by Kees de Jager and is published now by Springer Nature B.V. The journal is currently edited by Hans Bloemen. Its purpose is to provide a comprehensive synthesis of the various branches of space research.