rotation curve
31Malmquist bias — For other uses of Malmquist, see Malmquist (disambiguation). The Malmquist bias refers to an effect in observational astronomy which leads to the preferential detection of intrinsically bright objects. It was first popularized in 1922 by Swedish… …
32Redshift — This article is about the astronomical phenomenon. For other uses, see Redshift (disambiguation). Physical cosmology …
33Proper motion — The proper motion of a star is its angular change in position over time as seen from the center of mass of the solar system.[1] It is measured in seconds of arc per year, arcsec/yr, where 3600 arcseconds equal one degree.[2] This contrasts with… …
34List of unsolved problems in physics — This is a list of some of the major unsolved problems in physics. Some of these problems are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result. The others are… …
35Vera Rubin — Vera (Cooper) Rubin (born 23 July 1928) is an astronomer who has done pioneering work on galaxy rotation rates. Her opus magnus was the uncovering of the discrepancy between the predicted angular motion of galaxies and the observed motion, by… …
36Galaxy — 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… …
37UGC 8331 — Découverte Désignations DDO 169, PGC 46127 Observation (Époque J2000) Ascension droite 13h 15m 30.31s Déclinaison +47°& …
38Timeline of knowledge about galaxies, clusters of galaxies, and large-scale structure — Timeline of galaxies, clusters of galaxies, and large scale structure of the cosmosPre 20th Century* 400s BC Democritus proposes that the bright band in the night sky known as the Milky Way might consist of stars, * 300s BC Aristotle believes the …
39Tensor-vector-scalar gravity — (TeVeS) is a proposed relativistic theory which purports to explain galactic rotation curves without invoking dark matter. Originated by Jacob Bekenstein in 2004, it incorporates various dynamical and non dynamical tensor fields, vector fields… …
40Galaxie à faible brillance superficielle — Une galaxie à faible brillance superficielle (en abréviation LSB de l anglais Low Surface Bbrightness galaxy ), est une galaxie diffuse avec une brillance superficielle qui, vue depuis la Terre, est inférieure d au moins d une magnitude à celle… …
