advertisement

Infinite photos and videos for every Wiki article ·
Find something interesting to watch in seconds

Wars and Battles
Rare Coins
Celebrities
Presidents
Recovered Treasures
Largest Empires
Animals
Famous Castles
Kings of France
Richest US Counties
Orders and Medals
Tallest Buildings
Sports
Best Campuses
Great Museums
Largest Palaces
Supercars
Great Artists
Crown Jewels
British Monarchs
World Banknotes
Great Cities
Ancient Marvels
Countries of the World
Wonders of Nature
History by Country

more top lists

Ellipsoid

Videos

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

Artist's conception of Haumea, a Jacobi-ellipsoid dwarf planet, with its two moons

Sphere

Videos

Page
A sphere is a geometrical object that is a three-dimensional analogue to a two-dimensional circle. Formally, a sphere is the set of points that are all at the same distance r from a given point in three-dimensional space. That given point is the center of the sphere, and r is the sphere's radius. The earliest known mentions of spheres appear in the work of the ancient Greek mathematicians.

An image of one of the most accurate human-made spheres, as it refracts the image of Einstein in the background. This sphere was a fused quartz gyroscope for the Gravity Probe B experiment, and differs in shape from a perfect sphere by no more than 40 atoms (less than 10 nm) of thickness. It was announced on 1 July 2008 that Australian scientists had created even more nearly perfect spheres, accurate to 0.3 nm, as part of an international hunt to find a new global standard kilogram.

Deck of playing cards illustrating engineering instruments, England, 1702. King of spades: Spheres