## Sphere

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, which is in two dimensions, a sphere is the set of points which are all the same distance *r* from a given point in space. This distance *r* is known as the "radius" of the sphere, and the given point is known as the center of the sphere. The maximum straight distance through the sphere is known as the "diameter". It passes through the center and is thus twice the radius.

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### Some articles on sphere:

**Sphere**Electron Transfer

... in complexes, are tightly bound and constitute the "inner

**sphere**" ... Reactions in which these participate are called inner

**sphere**redox reactions ... solvent molecules constitute the "outer

**sphere**" ...

**Sphere**s

... For every

**sphere**there are multiple cuboids that may be inscribed within the

**sphere**... largest cuboid which can be inscribed within a

**sphere**is a cube ...

... position and pseudorange determines a

**sphere**centered on the satellite with radius equal to the pseudorange ... receiver position based on the intersection of three

**sphere**surfaces so determined ... In the usual case of two intersections of three

**sphere**surfaces, the point nearest the surface of the

**sphere**corresponding to the fourth satellite is chosen ...

... of this polytope corresponds to the center of a 6-

**sphere**in a moderately dense

**sphere**packing, in which each

**sphere**is tangent to 70 others the best known for 7 ...

**Sphere**Characterization

... In mathematics, a Kline

**sphere**characterization, named after John Robert Kline, is a topological characterization of a two-dimensional

**sphere**in terms of what sort of subset separates it ... A simple closed curve in a two-dimensional

**sphere**(for instance, its equator) separates the

**sphere**into two pieces upon removal ... If one removes a pair of points from a

**sphere**, however, the remainder is connected ...

### More definitions of "sphere":

- (
*noun*): A particular aspect of life or activity.

Synonyms: sector

- (
*noun*): Any spherically shaped artifact.

- (
*noun*): The geographical area in which one nation is very influential.

Synonyms: sphere of influence

- (
*noun*): A solid figure bounded by a spherical surface (including the space it encloses).

- (
*noun*): A particular environment or walk of life.

Example:*"His social sphere is limited"*

Synonyms: domain, area, orbit, field, arena

- (
*noun*): A three-dimensional closed surface such that every point on the surface is equidistant from the center.

### Famous quotes containing the word sphere:

“I count him a great man who inhabits a higher *sphere* of thought, into which other men rise with labor and difficulty; he has but to open his eyes to see things in a true light, and in large relations; whilst they must make painful corrections, and keep a vigilant eye on many sources of error.”

—Ralph Waldo Emerson (1803–1882)

“No person can be considered as possessing a good education without religion. A good education is that which prepares us for our future *sphere* of action and makes us contented with that situation in life in which God, in his infinite mercy, has seen fit to place us, to be perfectly resigned to our lot in life, whatever it may be.”

—Ann Plato (1820–?)

“Every person is responsible for all the good within the scope of his abilities, and for no more, and none can tell whose *sphere* is the largest.”

—Gail Hamilton (1833–1896)