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21sphere — [[t]sfɪər[/t]] n. v. sphered, spher•ing 1) math. a) a solid geometric figure generated by the revolution of a semicircle about its diameter; a round body whose surface is at all points equidistant from the center b) the surface of such a figure;… …
22About-Picard law — The 2001 About Picard law [abu pika:r] (named after French parliament members Nicolas About and Catherine Picard), a piece of French legislation, broadly speaking, makes it possible to act against organisations (legal entities) when such… …
23Odin Sphere — North American box art. Developer(s) Vanillaware Publisher(s) …
24Dyson sphere — A Dyson sphere (or shell as it appeared in the original paper) 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… …
25Public sphere — A coffeehouse discussion …
26Exotic sphere — In differential topology, a mathematical discipline, an exotic sphere is a differentiable manifold M that is homeomorphic but not diffeomorphic to the standard Euclidean n sphere. That is, M is a sphere from the point of view of all its… …
27Greater East Asia Co-Prosperity Sphere — Poster of Manchukuo promoting harmony between Japanese, Chinese, and Manchu. The caption, written from right to left, says: With the help of Japan, China, and Manchukuo, the world can be in peace. The flags shown are, left to right: the flag of… …
28Hill sphere — A Hill sphere is, roughly, the volume around an astronomical body (such as a planet) where it dominates in attraction of satellites to that body, rather than to a larger body (such as a star) which it orbits. Thus, for a planet to retain a moon,… …
29Two Sphere Universe — The Two Sphere Universe is a term coined by Thomas Samuel Kuhn, in his book The Copernican Revolution .The two sphere universe is a conception of the astronomical heavens by ancient Greece. It was one of several conceptions of the universe and… …
30Photon sphere — A photon sphere is a spherical region of space where gravity is strong enough that photons of light are forced to travel in orbits. The formula to find the radius for a circular photon orbit is: r=3GM/C2. Because of this equation photon spheres… …
