decrease in brightness

См. также в других словарях:

• 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

• Luminosity — has different meanings in several different fields of science.In photometry and color imagingIn photometry, luminosity is sometimes incorrectly used to refer to luminance, which is the density of luminous intensity in a given direction. The SI… …   Wikipedia

• eclipse — eclipser, n. /i klips /, n., v., eclipsed, eclipsing. n. 1. Astron. a. the obscuration of the light of the moon by the intervention of the earth between it and the sun (lunar eclipse) or the obscuration of the light of the sun by the intervention …   Universalium

• Apparent magnitude — Asteroid 65 Cybele and 2 stars with their magnitudes labeled The apparent magnitude (m) of a celestial body is a measure of its brightness as seen by an observer on Earth, normalized to the value it would have in the absence of the atmosphere.… …   Wikipedia

• Mira — For other uses, see Mira (disambiguation). Mira Mira as seen by Hubble. NASA image …   Wikipedia

• limb darkening — In astrophysics, the gradual decrease in observed brightness of the disk of a star from its centre to its edge (limb). This phenomenon, readily apparent in photographs of the Sun, occurs because the solar atmosphere s temperature increases with… …   Universalium

• Confocal laser scanning microscopy — (CLSM or LSCM) is a technique for obtaining high resolution optical images with depth selectivity.[1] The key feature of confocal microscopy is its ability to acquire in focus images from selected depths, a process known as optical sectioning.… …   Wikipedia

• Weber–Fechner law — The Weber–Fechner law attempts to describe the relationship between the physical magnitudes of stimuli and the perceived intensity of the stimuli. Ernst Heinrich Weber (1795–1878) was one of the first people to approach the study of the human… …   Wikipedia

• Noctilucent cloud — Polar mesospheric cloud Noctilucent clouds over Kuresoo bog, Viljandimaa, Estonia Abbreviation NLC/PMC Altitude …   Wikipedia

• Norman Robert Pogson — Infobox Scientist name = Norman Robert Pogson box width = image width =150px caption = Norman Robert Pogson birth date = March 23, 1829 birth place = Nottingham death date = June 23, 1891 death place = residence = citizenship = nationality =… …   Wikipedia

• Meteor shower — This article is about the falling of meteors. For the TV program, see Meteor Shower (TV series). A meteor shower is a celestial event in which a number of meteors are observed to radiate from one point in the night sky. These meteors are caused… …   Wikipedia