background brightness
21astronomy — /euh stron euh mee/, n. the science that deals with the material universe beyond the earth s atmosphere. [1175 1225; ME astronomie ( < AF) < L astronomia < Gk. See ASTRO , NOMY] * * * I Science dealing with the origin, evolution, composition,… …
22List of astronomy acronyms — This is a compilation of acronyms commonly used in astronomy. Most of the acronyms are drawn from professional astronomy and are used quite frequently in scientific publications. However, a few of these acronyms are frequently used by the general …
23Nintendo 3DS — 3ds redirects here. For other uses, see 3ds (disambiguation). Nintendo 3DS …
24XrossMediaBar — The logo found on Compatible XMB devices The XrossMediaBar (pronounced cross media bar and officially abbreviated as XMB) is a graphical user interface developed by Sony Computer Entertainment. The interface features icons that are spread… …
25Theory of camouflage — The theoretical basis for camouflage is the underlying methodology used in by camouflage, whether natural or man made. The definition of camouflage involves concealment and obscurity , whether applied to the natural coloration of animals, or the… …
26nebula — nebular, adj. /neb yeuh leuh/, n., pl. nebulae / lee , luy /, nebulas. 1. Astron. a. Also called diffuse nebula. a cloud of interstellar gas and dust. Cf. dark nebula, emission nebula, reflection nebula …
27SN 1054 — Supernova SN 1054 The Crab Nebula, remnant of SN 1054. Credit: NASA/ESA. Observation data (Epoch ?) Supernova type …
28Astrophysical maser — An astrophysical maser is a naturally occurring source of stimulated spectral line emission, typically in the microwave portion of the electromagnetic spectrum. This emission may arise in molecular clouds, comets, planetary atmospheres, stellar… …
29Helicon Filter — Infobox Software name = Helicon Filter caption = Helicon Filter 4.81 running on Windows XP developer = Helicon Soft Ltd. latest release version = 4.90 latest release date = September 25, 2008 latest preview version = latest preview date =… …
30perception — perceptional, adj. /peuhr sep sheuhn/, n. 1. the act or faculty of apprehending by means of the senses or of the mind; cognition; understanding. 2. immediate or intuitive recognition or appreciation, as of moral, psychological, or aesthetic… …
