Changes

|isbn=9-789-02-4936-5

|isbn=9-789-02-4936-5

|quote=Remark on Dark Matter: As is well known much of the support for the existence of the dark matter is due to the observed very high velocities of gas molecules or galaxies.For example galaxies in the far-off Coma-cluster are observed whirling around one another faster than the laws of physics would allow. So is the mysteriously rapid rotation of spiral galaxies. Equation (2.25) clearly shows that the observed velocity by us is not the velocity measured by a local observer at a relative time <math>t</math> with respect to us. He measures a smaller velocity, and the more back in time the more the velocity decreases. Does this mean that the hypothetical dark matter can be abolished as the "luminiferous ether" was proved to be superfluous by special relativity?       

|quote=Remark on Dark Matter: As is well known much of the support for the existence of the dark matter is due to the observed very high velocities of gas molecules or galaxies.For example galaxies in the far-off Coma-cluster are observed whirling around one another faster than the laws of physics would allow. So is the mysteriously rapid rotation of spiral galaxies. Equation (2.25) clearly shows that the observed velocity by us is not the velocity measured by a local observer at a relative time <math>t</math> with respect to us. He measures a smaller velocity, and the more back in time the more the velocity decreases. Does this mean that the hypothetical dark matter can be abolished as the "luminiferous ether" was proved to be superfluous by special relativity?       

}}</ref> that astronomers infer when the actual mass of any observed celestial object is not sufficient to account for an observed gravitational effect.{{#tag:ref|cf. "...much of the support for the existence of the dark matter is due to the observed very high velocities of gas molecules or galaxies. For example galaxies in the far-off Coma-cluster are observed whirling around one another faster than the laws of physics would allow. So is the mysteriously rapid rotation of spiral galaxies."<ref name="CSR"/>|group=note}} It is one of two concepts (the other is [[dark energy]]) that [[evolution]]istic astronomers invoke to account for observations that old-[[universe]] cosmologies, including the [[Big Bang]], cannot explain. The term was introduced by Swiss astronomer Fritz Zwicky who hypothesized that it must be the gravity of unseen ''dark matter'' that holds together fast moving galaxies in clusters.<ref>{{Citation | last = Zwicky | first = F. | bibcode = 1933AcHPh...6..110Z | title = Die Rotverschiebung von extragalaktischen Nebeln | year = 1933 | journal = Helvetica Physica Acta | volume = 6 | pages = 110&ndash;127}} See also {{Citation | last = Zwicky | first = F. | bibcode = 1937ApJ....86..217Z | title = On the Masses of Nebulae and of Clusters of Nebulae | year = 1937 | journal = Astrophysical Journal | volume = 86 | pages = 217 | doi = 10.1086/143864}}</ref><ref>{{cite web

}}</ref> that astronomers infer when the actual mass of any observed celestial object is not sufficient to account for an observed gravitational effect.{{#tag:ref|cf. "...much of the support for the existence of the dark matter is due to the observed very high velocities of gas molecules or galaxies. For example galaxies in the far-off Coma-cluster are observed whirling around one another faster than the laws of physics would allow. So is the mysteriously rapid rotation of spiral galaxies."<ref name="CSR"/>|group=note}} It is one of two concepts (the other is [[dark energy]]) that [[evolution]]istic astronomers invoke to account for observations that old-[[universe]] cosmologies, including the [[Big Bang]], cannot explain. The term was introduced by Swiss astronomer Fritz Zwicky who hypothesized that it must be the gravity of unseen ''dark matter'' that holds together fast moving galaxies in clusters.<ref>{{Cite web

|author=F. Zwicky

|title = Die Rotverschiebung von extragalaktischen Nebeln  

|year = 1933  

|publisher = Helvetica Physica Acta  

|volume = 6  

|pages = 110-127

|url=http://adsabs.harvard.edu/abs/1933AcHPh...6..110Z}}</ref><ref>{{cite web

|title=Dark Matter, Dark Energy and Inflation: The Big Mysteries of Cosmology

|title=Dark Matter, Dark Energy and Inflation: The Big Mysteries of Cosmology

|author=Michail S. Turner  

|author=Michail S. Turner