ellipticity of galaxy

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• Galaxy morphological classification — Artist s concept illustrating bulge no bulge spiral galaxies. Galaxy morphological classification is a system used by astronomers to divide galaxies into groups based on their visual appearance. There are several schemes in use by which galaxies… …   Wikipedia

• galaxy — /gal euhk see/, n., pl. galaxies. 1. Astron. a. a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space. b. (usually cap.) See Milky Way. 2. any large and brilliant or impressive… …   Universalium

• Galaxy — This article is about the astronomical structure. For other uses, see Galaxy (disambiguation). NGC 4414, a typical spiral galaxy in the constellation Coma Berenices, is about 55,000 light years in diameter and approximately 60 million light… …   Wikipedia

• Weak gravitational lensing — While the presence of any mass bends the path of light passing near it, this effect rarely produces the giant arcs and multiple images associated with strong gravitational lensing. Most lines of sight in the universe are thoroughly in the weak… …   Wikipedia

• Hubble sequence — The Hubble sequence is a morphological classification scheme for galaxies invented by Edwin Hubble in 1936.cite book |last=Hubble |first=E. P. |authorlink=Edwin Hubble |title=The Realm of the Nebulae |year=1936 |publisher=Yale University Press… …   Wikipedia

• Gravitational lensing formalism — In general relativity, a point mass deflects a light ray with impact parameter b by an angle hat{alpha} = frac{4GM}{c^2b}. A naïve application of Newtonian gravity can yield exactly half this value, where the light ray is assumed as a massed… …   Wikipedia

• Draco Dwarf — Central part of Draco Dwarf by HST Observation data (J2000 epoch) Constellation …   Wikipedia

• Strong gravitational lensing — is a gravitational lensing effect that is strong enough to produce multiple images, arcs, or even Einstein rings. Generally, the strong lensing effect requires the projected lens mass density greater than the critical density Sigma {cr},. For… …   Wikipedia

• Hubble , Edwin Powell — (1889–1953) American astronomer and cosmologist Hubble, who was born in Marshfield, Missouri, was the son of a lawyer. He was educated at the University of Chicago where he was influenced by the astronomer George Hale and, as a good athlete, was… …   Scientists

• Axion — Infobox Particle name = Axion status = Hypothetical interaction = Gravity, Electromagnetic theorized = 1977, Peccei and Quinn mass = 10−6 to 1 eV/c2 electric charge = 0 spin = 0The axion is a hypothetical elementary particle postulated by Peccei… …   Wikipedia

• National Geographic Society - Palomar Observatory Sky Survey — The National Geographic Society Palomar Observatory Sky Survey (NGS POSS) [A. G. Wilson, Trans. I.A.U. 8, 335–336 (1952); [http://adsabs.harvard.edu/abs/1963bad..book..481M R. L. Minkowski G. O. Abell, in Basic Astronomical Data: Stars and… …   Wikipedia