brightness
41brightness — bright•ness [[t]ˈbraɪt nɪs[/t]] n. 1) the quality of being bright 2) opt the luminance of a body that an observer uses to determine the comparative luminance of another body • Etymology: bef. 950 …
42Tolman 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… …
43Surface 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 …
44Sky 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… …
45Low 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… …
46The Brightness — Infobox Album | Name = The Brightness Type = Album Artist = Anaïs Mitchell Released = February 13 2007 Recorded = Genre = Folk Length = Label = Righteous Babe Records Producer = Michael Chorney Reviews = * Allmusic Rating|3.5|5… …
47Surface 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 …
48Intrinsic brightness — Astronomers use the term intrinsic brightness (also termed absolute magnitude) to refer to how bright a star would be without the effects of distance or absorption due to interstellar dust or gas. While a bright distant star might have apparent… …
49apparent brightness — noun The brightness of a star as measured by an observer, as opposed to its intrinsic brightness when corrected for distance or absorption …
50intrinsic brightness — noun The brightness a star would have if not attenuated by distance or intervening gas or dust. As opposed to apparent brightness which it has as measured at a distance …
