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Sphere (disambiguation)

From Wikipedia, the free encyclopedia

A sphere is a three-dimensional object shaped like a ball; it may also refer to a sphere-like region or shell.

Sphere may also refer to:

Astronomy

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  • Armillary sphere, a physical model of the celestial sphere
  • Celestial sphere, the astronomical description of the sky
  • Celestial spheres or planetary spheres, refer to a geocentric model of the universe and the associated postulate of a "Musica Universalis" (Music of the Spheres)
  • Dyson sphere, a hypothetical megastructure that encompasses a star and captures a large percentage of its solar power output
  • Hill sphere, the spherical region around an astronomical body where the primary gravitational influence on an orbiting object is that body
  • Spectro-Polarimetric High-Contrast Exoplanet Research (SPHERE) is an adaptive optics system and coronagraphic facility at the Very Large Telescope (VLT)
  • Sphere of influence (astrodynamics), similar to the Hill sphere, but smaller, only about 60% of the radius
  • Sphere of influence (black hole), a region around a supermassive black hole
  • SPHERES (Synchronized Position Hold, Engage, Reorient Experimental Satellites), a formation flight testbed developed by MIT's Space Systems Laboratory
  • SPHEREx (Spectro-Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer), a proposed space telescope

Human sciences

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  • Separate spheres, an ideological term referring to separation between a private sphere and a public sphere in some societies
  • Sphere of influence, a metaphorical region of influence surrounding a country, person or concept

Mathematics

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  • n-sphere, the set of points at fixed distance from a central point in n+1 dimensional space
  • Spherical surface, the boundary of a sphere (also known simply as sphere in mathematics)
  • Spherical volume, the region inside a sphere (also known as a ball in mathematics)
  • Unit sphere, the set of points at a distance of 1 from a central point

Arts, entertainment, and media

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Architecture

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Films

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Literature

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Music

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Groups

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Albums and songs

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Other uses

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See also

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