Surface brightness — is a concept used in astronomy when describing extended astronomical objects such as galaxies and nebulae.General descriptionThe apparent magnitude of an astronomical object is generally given as an integrated value mdash;if a galaxy is quoted as … Wikipedia
surface brightness — šviesis statusas T sritis ekologija ir aplinkotyra apibrėžtis Žvaigždės ar kito kosminio kūno per laiko vienetą išspinduliuojama energija. Matuojamas džauliais per sekundę (vatais) arba Saulės šviesio vienetais. atitikmenys: angl. luminosity;… … Ekologijos terminų aiškinamasis žodynas
Surface brightness fluctuation — (SBF) is a secondary distance indicator used to estimate distances to galaxies. The technique uses the fact that galaxies are made up of a finite number of stars. The number of stars in any small patch of the galaxy will vary from point to point … Wikipedia
Tolman surface brightness test — A Tolman surface brightness test is a comparison of the surface brightness of galaxies as a function of their redshift (measured as z ). Such a comparison was first proposed in 1930 by Richard C. Tolman as a test of whether the universe is… … Wikipedia
Low surface brightness galaxy — A low surface brightness galaxy or LSB galaxy is a diffuse galaxy with a surface brightness that, when viewed from Earth, is at least one magnitude lower than the ambient night sky.Most LSBs are dwarf galaxies, in which most of their baryonic… … Wikipedia
Brightness temperature — is the temperature at which a blackbody in thermal equilibrium with its surroundings would have to be in order to duplicate the observed intensity of an object at a frequency u.This is a useful concept only for radiation that obeys the… … Wikipedia
brightness — /bruyt nis/, n. 1. the quality of being bright. 2. Optics. the luminance of a body, apart from its hue or saturation, that an observer uses to determine the comparative luminance of another body. Pure white has the maximum brightness, and pure… … Universalium
Surface-conduction electron-emitter display — A surface conduction electron emitter display (SED) is a flat panel display technology that uses surface conduction electron emitters for every individual display pixel. The surface conduction emitter emits electrons that excite a phosphor… … Wikipedia
Sky brightness — This article is primarily about the brightness of the night sky. For daytime situations, please see Diffuse sky radiation and Rayleigh Scattering. The fact that the sky isn t absolutely dark at night can easily be observed. Were the sky (in the… … Wikipedia
Luminance (Photometric Brightness) — WikiV Luminous intensity of any surface in a given direction per unit of projected area of the surface viewed from that direction. The amount of brightness, measured in lumens that is given off by a pixel or area on a screen.[6] … Audio and video glossary
