ELLIPSOID - significado y definición. Qué es ELLIPSOID
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Qué (quién) es ELLIPSOID - definición

QUADRIC SURFACE THAT LOOKS LIKE A DEFORMED SPHERE
Ellipsoids; Ellipsoidal; Semi-principal axis; Elipsoid; Ellipsoid (geometry); Tri-axial ellipsoid; Scalene ellipsoid; Triaxial ellipsoid; Hyperellipsoid; Ellipsoid plane section
  • Haumea}}, a Jacobi-ellipsoid [[dwarf planet]], with its two moons
  • ''S''<sub>1</sub> ''S''<sub>2</sub>}}}}, length of the string (red)
  • Plane section of an ellipsoid (see example)
  • Plane section of the unit sphere (see example)
  • ellipsoid as an affine image of the unit sphere
  • Plane section of an ellipsoid
  • '''Top:''' 3-axial Ellipsoid with its focal hyperbola.<br>
'''Bottom:''' parallel and central projection of the ellipsoid such that it looks like a sphere, i.e. its apparent shape is a circle
  • ''c'' {{=}} 3}}, ''bottom right''
}}
  • Determination of the semi axis of the ellipsoid
  • Pins-and-string construction of an ellipsoid, blue: focal conics

ellipsoid         
[?'l?ps??d]
¦ noun a three-dimensional figure symmetrical about each of three perpendicular axes, whose plane sections normal to one axis are circles and all the other plane sections are ellipses.
Derivatives
ellipsoidal adjective
Ellipsoid         
·adj ·Alt. of Ellipsoidal.
II. Ellipsoid ·noun A solid, all plane sections of which are ellipses or circles. ·see Conoid, ·noun, 2 (a).
Ellipsoid         
An ellipsoid is a surface that may be obtained from a sphere by deforming it by means of directional scalings, or more generally, of an affine transformation.

Wikipedia

Ellipsoid

An ellipsoid is a surface that may be obtained from a sphere by deforming it by means of directional scalings, or more generally, of an affine transformation.

An ellipsoid is a quadric surface;  that is, a surface that may be defined as the zero set of a polynomial of degree two in three variables. Among quadric surfaces, an ellipsoid is characterized by either of the two following properties. Every planar cross section is either an ellipse, or is empty, or is reduced to a single point (this explains the name, meaning "ellipse-like"). It is bounded, which means that it may be enclosed in a sufficiently large sphere.

An ellipsoid has three pairwise perpendicular axes of symmetry which intersect at a center of symmetry, called the center of the ellipsoid. The line segments that are delimited on the axes of symmetry by the ellipsoid are called the principal axes, or simply axes of the ellipsoid. If the three axes have different lengths, the figure is a triaxial ellipsoid (rarely scalene ellipsoid), and the axes are uniquely defined.

If two of the axes have the same length, then the ellipsoid is an ellipsoid of revolution, also called a spheroid. In this case, the ellipsoid is invariant under a rotation around the third axis, and there are thus infinitely many ways of choosing the two perpendicular axes of the same length. If the third axis is shorter, the ellipsoid is an oblate spheroid; if it is longer, it is a prolate spheroid. If the three axes have the same length, the ellipsoid is a sphere.

Ejemplos de uso de ELLIPSOID
1. Bigger headache While NASA astrophysicist Gary Hinshaw at Goddard Space Flight Center in Greenbelt, Md., felt it "fair to say that the data weakly favor the ellipsoidal model," he told SPACE.com that invoking an ellipsoid shape for the universe to solve the quadrupole anomaly created a bigger headache involving why the universe might be ellipsoid to begin with.
2. An ellipsoid universe could be caused by a magnetic field pervading the cosmos that stretches space–time, he said, or by space–time defects such as cosmic strings, immensely dense structures just a proton or so wide stretched to intergalactic scales, whose gravity could distort space and time.
3. Now astrophysicist Leonardo Campanelli of the University of Ferrara and his colleagues Paolo Cea and Luigi Tedesco at the University of Bari, all in Italy, have found that a universe shaped a bit like an oval can explain this so–called "quadrupole anomaly." If the universe did not expand as a sphere after atoms first formed but instead as a slightly more elongated shape known as an ellipsoid, that would explain the odd cosmic microwave intensities seen at the largest scales, the researchers suggest.