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In [[classical mechanics|classical]] and [[quantum mechanics]], conserved quantities generally correspond to a [[symmetry]] of the system. The conservation of ...e.g., by the method of [[Poisson brackets]], as described below. Conserved quantities of this kind are called "dynamic", in contrast to the usual "geometric" con ...

...vity is also part of the framework of the standard [[Big Bang]] model of [[physical cosmology|cosmology]]. ...sing radically new concepts of [[space]] and [[time]]. Some then-accepted physical theories were inconsistent with that framework; a key example was Newton's ...

...with any [[derivative|differentiable]] [[symmetry in physics|symmetry of a physical system]].<ref>{{Harvnb|Osen|1974|pp=144–145}}; {{Harvnb|Lederman|Hill|2004| ...over the world to Göttingen, which became a major hub of mathematical and physical research. From 1926 to 1930 the Russian [[topology|topologist]], [[Pavel Al ...

...ek]] philosophers. In the 17th and 18th centuries, [[chemist]]s provided a physical basis for this idea by showing that certain substances could not be further ...wikt:discrete|discrete]] units and cannot be divided into arbitrarily tiny quantities has been around for [[millennia]], but these ideas were founded in abstract ...

{{dablink|This article is about the physical phenomenon. For the photochemical usage, see [[bathochromic shift]]. For ot ...er (1973) and Weinberg (1971) or any of the [[physical cosmology#Textbooks|physical cosmology textbooks]]</ref> ...

..., both [[Secular phenomena|secularly]] and [[Frequency|periodically]]. The quantities given are the values at the instant [[J2000.0]] of the secular variation, i | title=Allen's Astrophysical Quantities ...

Many other physical systems can be modeled as sets of [[oscillation#Coupled_oscillations|couple ...= 1924 | title = The Settling of Small Particles in a Fluid | journal = [[Physical Review]] | volume = 23 | pages = 412–426 | doi = 10.1103/PhysRev.23.412}}</ ...

...uch as [[LIGO]]. In addition, general relativity is the basis of current [[Physical cosmology|cosmological]] models of a consistently expanding universe. ...ory to the [[universe]] as a whole, initiating the field of relativistic [[physical cosmology|cosmology]]. In line with contemporary thinking, he assumed a sta ...

...he ''[[Mars Reconnaissance Orbiter]]'' have revealed the presence of large quantities of water ice both at the poles (July 2005)<ref name="specials1">Water ice i ==Physical characteristics== ...

...ating orbit|osculating]] values at the precise [[J2000]] epoch. Barycentre quantities are given because, in contrast to the planetary centre, they do not experie Neptune's internal structure resembles that of [[Uranus#Physical characteristics|Uranus]]. Its atmosphere forms about 5 to 10 percent of its ...

| doi=10.1146/annurev.aa.33.090195.000451 }}</ref> Although Vega fits the physical profile for this type of variable, other observers have found no such varia | booktitle=Proceedings of the Symposium, Calibration of fundamental stellar quantities ...

...rix group]]s, for example, can be used to understand fundamental [[physics|physical]] laws underlying [[special relativity]] and symmetry phenomena in molecula ...tries]] and crystal symmetries. These symmetries underlie the chemical and physical behavior of these systems, and group theory enables simplification of [[qua ...

...half-life of about 80&nbsp;million years, long enough to be found in trace quantities in nature. === Physical === ...