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Sphere print that page


A sphere (from Greek σφαῖρα — sphaira , "globe, ball") is a perfectly round geometrical object in three-dimensional space , such as the shape of a round ball . Like a circle in two dimensions, a perfect sphere is completely symmetrical around its center, with all points on the

3-sphere print that page

In mathematics , a 3 sphere is a higher-dimensional analogue of a sphere . It consists of the set of points equidistant from a fixed central point in 4-dimensional Euclidean space . Just as an ordinary sphere (or 2 sphere ) is a two dimensional surface that forms the boundary of a ball | 2011/5/1 21:17:16

H-Sphere print that page

H Sphere From Wikipedia, the free encyclopedia Jump to: navigation , search H Sphere Stable release 3.0 Patch 8 / January 8, 2008 Written in Java Operating system Linux , FreeBSD , Windows Type Control Panel (Web Hosting) License proprietary Website http | 2010/9/25 6:42:30

Sphere 1 print that page


The Sphere I was a personal computer completed in 1975 by Michael Donald Wise (1949–2002), founder of Sphere Corporation, of Bountiful, Utah. The Sphere I featured a Motorola 6800 CPU , onboard ROM , Monitor, 4 KB of RAM , and a keyboard with a numeric keypad . Sphere 1 has been called

n-sphere print that page

In mathematics , an n sphere is a generalization of the surface of an ordinary sphere to arbitrary dimension . For any natural number n , an n sphere of radius r is defined as the set of points in ( n  + 1)-dimensional Euclidean space which are at distance r from a central point | 2010/9/24 22:07:41

Strömgren sphere print that page

In theoretical astrophysics , a Strömgren sphere is the sphere of ionized hydrogen (H II) around a young star of the spectral classes O or B . Its counterpart in the real world are the H II-regions , a type of emission nebula , the most prominent of which is the Rosette Nebula . It was | 2011/7/5 6:25:57

Dyson sphere print that page

A Dyson sphere is a hypothetical megastructure originally described by Freeman Dyson . Such a sphere " would be a system of orbiting solar power satellites meant to completely encompass a star and capture most or all of its energy output. Dyson speculated that such structures would be | 2011/10/5 7:19:23

Sphere packing print that page


In geometry , a sphere packing is an arrangement of non-overlapping spheres within a containing space. The spheres considered are usually all of identical size, and the space is usually three- dimensional Euclidean space . However, sphere packing problems can be generalised to consider

Riemann sphere print that page


In mathematics , the Riemann sphere (or extended complex plane ), named after the 19th century mathematician Bernhard Riemann , is the sphere obtained from the complex plane by adding a point at infinity . The sphere is the geometric representation of the extended complex numbers , which

Celestial sphere print that page


In astronomy and navigation , the celestial sphere is an imaginary sphere of arbitrarily large radius , concentric with the Earth and rotating upon the same axis . All objects in the sky can be thought of as projected upon the celestial sphere . Projected upward from Earth's equator