Data Portal @ linkeddatafragments.org

Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Cosmological_principle> ?p ?o. }

• Cosmological_principle abstract "In modern physical cosmology, the cosmological principle is an axiom that embodies the working assumption or premise that the distribution of matter in the universe is homogeneous and isotropic when viewed on a large enough scale, since the forces are expected to act uniformly throughout the universe, and should, therefore, produce no observable irregularities in the large scale structuring over the course of evolution of the matter field that was initially laid down by the Big Bang.Astronomer William Keel explains:The cosmological principle is usually stated formally as 'Viewed on a sufficiently large scale, the properties of the Universe are the same for all observers.' This amounts to the strongly philosophical statement that the part of the Universe which we can see is a fair sample, and that the same physical laws apply throughout. In essence, this in a sense says that the Universe is knowable and is playing fair with scientists.The cosmological principle contains three implicit qualifications and two testable consequences. The first implicit qualification is that "observers" means any observer at any location in the universe, not simply any human observer at any location on Earth: as Andrew Liddle puts it, "the cosmological principle [means that] the universe looks the same whoever and wherever you are."The second implicit qualification is that "looks the same" does not mean physical structures necessarily, but the effects of physical laws in observable phenomena. Thus, wavelength ratios observed for different ionic species in the absorption spectra of quasi stellar objects (QSO or quasars) place a limit on any variation in the fine-structure constant to less than 1 part in 1 million out to a distance in space (and time) of z = 3 (about 6500 megaparsecs or 11.5 billion light years); as the fine-structure constant is determined by the relation between the speed of light (c), Planck's constant (h) and the electron charge (e), these physical constants are constrained as well.The third qualification, related to the second, is that variation in physical structures can be overlooked, provided this does not imperil the uniformity of conclusions drawn from observation: the sun is different from the Earth, our galaxy is different from a black hole, some galaxies advance toward rather than recede from us, and the universe has a "foamy" texture of galaxy clusters and voids, but none of these different structures appears to violate the basic laws of physics.The two testable structural consequences of the cosmological principle are homogeneity and isotropy. Homogeneity means that the same observational evidence is available to observers at different locations in the universe ("the part of the Universe which we can see is a fair sample"). Isotropy means that the same observational evidence is available by looking in any direction in the universe ("the same physical laws apply throughout"). The principles are distinct but closely related, because a universe that appears isotropic from any two (for a spherical geometry, three) locations must also be homogeneous.The cosmological principle is first clearly asserted in the Philosophiæ Naturalis Principia Mathematica (1687) of Isaac Newton. In contrast to earlier classical or medieval cosmologies, in which Earth rested at the center of Universe, Newton conceptualized the earth as a sphere in orbital motion around the sun within an empty space that extended uniformly in all directions to immeasurably large distances. He then showed, through a series of mathematical proofs on detailed observational data of the motions of planets and comets, that their motions could be explained by a single principle of "universal gravitation" that applied as well to the orbits of the Galilean moons around Jupiter, the moon around the earth, the earth around the sun, and to falling bodies on earth. That is, he asserted the equivalent material nature of all bodies within the solar system, the identical nature of the sun and distant stars ("the light of the fixed stars is of the same nature with the light of the sun, ... and lest the systems of the fixed stars should, by their gravity, fall on each other, [God] hath placed those systems at immense distances from one another"), and thus the uniform extension of the physical laws of motion to a great distance beyond the observational location of earth itself.".
• Cosmological_principle wikiPageID "173937".
• Cosmological_principle wikiPageRevisionID "595159574".
• Cosmological_principle hasPhotoCollection Cosmological_principle.
• Cosmological_principle subject Category:Physical_cosmology.
• Cosmological_principle subject Category:Principles.
• Cosmological_principle type Abstraction100002137.
• Cosmological_principle type Cognition100023271.
• Cosmological_principle type Content105809192.
• Cosmological_principle type Generalization105913275.
• Cosmological_principle type Idea105833840.
• Cosmological_principle type Principle105913538.
• Cosmological_principle type Principles.
• Cosmological_principle type PsychologicalFeature100023100.
• Cosmological_principle comment "In modern physical cosmology, the cosmological principle is an axiom that embodies the working assumption or premise that the distribution of matter in the universe is homogeneous and isotropic when viewed on a large enough scale, since the forces are expected to act uniformly throughout the universe, and should, therefore, produce no observable irregularities in the large scale structuring over the course of evolution of the matter field that was initially laid down by the Big Bang.Astronomer William Keel explains:The cosmological principle is usually stated formally as 'Viewed on a sufficiently large scale, the properties of the Universe are the same for all observers.' This amounts to the strongly philosophical statement that the part of the Universe which we can see is a fair sample, and that the same physical laws apply throughout. ".
• Cosmological_principle label "Cosmological principle".
• Cosmological_principle label "Kosmologisch principe".
• Cosmological_principle label "Kosmologisches Prinzip".
• Cosmological_principle label "Principe cosmologique".
• Cosmological_principle label "Principio cosmologico".
• Cosmological_principle label "Principio cosmológico".
• Cosmological_principle label "Princípio cosmológico".
• Cosmological_principle label "Zasada kosmologiczna".
• Cosmological_principle label "Космологический принцип".
• Cosmological_principle label "مبدأ كوني".
• Cosmological_principle label "宇宙原理".
• Cosmological_principle label "宇宙學原理".
• Cosmological_principle sameAs Kosmologický_princip.
• Cosmological_principle sameAs Kosmologisches_Prinzip.
• Cosmological_principle sameAs Principio_cosmológico.
• Cosmological_principle sameAs Principe_cosmologique.
• Cosmological_principle sameAs Prinsip_kosmologi.
• Cosmological_principle sameAs Principio_cosmologico.
• Cosmological_principle sameAs 宇宙原理.
• Cosmological_principle sameAs Kosmologisch_principe.
• Cosmological_principle sameAs Zasada_kosmologiczna.
• Cosmological_principle sameAs Princípio_cosmológico.
• Cosmological_principle sameAs m.017gjt.
• Cosmological_principle sameAs Q319903.
• Cosmological_principle sameAs Q319903.
• Cosmological_principle sameAs Cosmological_principle.
• Cosmological_principle wasDerivedFrom Cosmological_principle?oldid=595159574.
• Cosmological_principle isPrimaryTopicOf Cosmological_principle.