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What (who) is -sphere - definition
3-DIMENSIONAL COMPACT MANIFOLD, DEFINED AS THE POINTS OF UNIT NORM IN EUCLIDEAN 4-SPACE
Three-dimensional sphere; Oversphere; Three-sphere; Three sphere; 3-dimensional sphere; Gongyl; 3 sphere
![flat torus]]'' case.](https://commons.wikimedia.org/wiki/Special:FilePath/Toroidal coord.png?width=200 "flat torus]]'' case.")
-sphere
¦ combining form denoting a structure or region of spherical form, especially a region round the earth: ionosphere.
SPHERES
![Roundest objects in the world created].](https://commons.wikimedia.org/wiki/Special:FilePath/Einstein gyro gravity probe b.jpg?width=200 "Roundest objects in the world created].")
![Deck of playing cards illustrating engineering instruments, England, 1702. [[King of spades]]: Spheres](https://commons.wikimedia.org/wiki/Special:FilePath/King of spades- spheres.jpg?width=200 "Deck of playing cards illustrating engineering instruments, England, 1702. [[King of spades]]: Spheres")
ROUND, ROTATIONALLY SYMMETRIC SHAPE OF THE 2D SURFACE OF A BALL IN 3D SPACE
Spherical; 2-sphere; Topological sphere; Hemispherical; Two-sphere; Globose; Spheres; Volume of a sphere; Sphere (geometry); Volume Of A Sphere; Two-dimensional sphere; S²; X^2+y^2+z^2=r^2; Surface area of a sphere; Maschler space; Orb (shape); Spherical surface; Spherical volume; Surface area of the sphere; ⁴⁄₃πr³; Volume of sphere; 1-sphere; Spherical region; Spherical curve; Curve on a sphere; Perfect sphere; Spherule
The Synchronized Position Hold Engage and Reorient Experimental Satellite (SPHERES) are a series of miniaturized satellites developed by MIT's Space Systems Laboratory for NASA and US Military, to be used as a low-risk, extensible test bed for the development of metrology, formation flight, rendezvous, docking and autonomy algorithms that are critical for future space missions that use distributed spacecraft architecture, such as Terrestrial Planet Finder and Orbital Express.
sphere
ROUND, ROTATIONALLY SYMMETRIC SHAPE OF THE 2D SURFACE OF A BALL IN 3D SPACE
Spherical; 2-sphere; Topological sphere; Hemispherical; Two-sphere; Globose; Spheres; Volume of a sphere; Sphere (geometry); Volume Of A Sphere; Two-dimensional sphere; S²; X^2+y^2+z^2=r^2; Surface area of a sphere; Maschler space; Orb (shape); Spherical surface; Spherical volume; Surface area of the sphere; ⁴⁄₃πr³; Volume of sphere; 1-sphere; Spherical region; Spherical curve; Curve on a sphere; Perfect sphere; Spherule
(spheres)
1.
A sphere is an object that is completely round in shape like a ball.
N-COUNT
2.
A sphere of activity or interest is a particular area of activity or interest.
...the sphere of international politics.
...nurses, working in all spheres of the health service.
= field
N-COUNT: usu N of n
3.
A sphere of people is a group of them who are similar in social status or who have the same interests.
...the realities of life outside the government and academic spheres of society.
N-COUNT: usu N of n
Wikipedia
3-sphere
In mathematics, a 3-sphere, glome or hypersphere is a higher-dimensional analogue of a sphere. It may be embedded in 4-dimensional Euclidean space as the set of points equidistant from a fixed central point. Analogous to how the boundary of a ball in three dimensions is an ordinary sphere (or 2-sphere, a two-dimensional surface), the boundary of a ball in four dimensions is a 3-sphere (an object with three dimensions). A 3-sphere is an example of a 3-manifold and an n-sphere.
Examples of use of -sphere
1. Not long ago, such interfaith fellowship would have been as common in the private sphere as the public sphere.
2. Investigating the military sphere is not sufficient.
3. The first, of course, was the socioeconomic sphere.
4. "The justices carved out this little sphere of individual rights with the Oregon ruling, and I would hope that would migrate into the pain medication sphere," he said.
5. Just as the sphere rose up, one of the passengers emerged from the top, returned to the ground to grab something, then flew back to the sphere.