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An O'Neill cylinder (also called an O'Neill colony) is a space settlement concept proposed by American physicist Gerard K. O'Neill in his 1976 book The High Frontier: Human Colonies in Space. [ 1 ] O'Neill proposed the colonization of space for the 21st century, using materials extracted from the Moon and later from asteroids. [ 2 ]
A Stanford torus interior (cutaway view) Interior view of a large scale O'Neill cylinder, showing alternating land and window stripes. A space settlement (also called a space habitat, spacestead, space city or space colony) is a settlement in outer space, sustaining more extensively habitation facilities in space than a general space station or spacecraft.
In projective geometry, a cylinder is simply a cone whose apex (vertex) lies on the plane at infinity. If the cone is a quadratic cone, the plane at infinity (which passes through the vertex) can intersect the cone at two real lines, a single real line (actually a coincident pair of lines), or only at the vertex.
The Cyrus Cylinder is a barrel-shaped cylinder of baked clay measuring 22.5 centimetres (8.9 in) by 10 centimetres (3.9 in) at its maximum diameter. [1] It was created in several stages around a cone-shaped core of clay within which there are large grey stone inclusions.
A two-dimensional representation of the Klein bottle immersed in three-dimensional space. In mathematics, the Klein bottle (/ ˈ k l aɪ n /) is an example of a non-orientable surface; that is, informally, a one-sided surface which, if traveled upon, could be followed back to the point of origin while flipping the traveler upside down.
Although Sumerian cylinder seals depict reed houses, the courtyard house was the predominant typology, which has been used in Mesopotamia to the present day. This house called é ( Cuneiform : 𒂍 , E₂ ; Sumerian : e₂ ; Akkadian : bītu ) faced inward toward an open courtyard which provided a cooling effect by creating convection currents.
It is not uncommon for some haniwa to be painted with red dye or other colors. Besides the cylindrical haniwa (enkei-haniwa), another common type was the house-shaped haniwa (keisho-haniwa). Other things that fell into the category of keisho-haniwa were those shaped like humans, animals, and swords.
List of moments of inertia. Moment of inertia, denoted by I, measures the extent to which an object resists rotational acceleration about a particular axis; it is the rotational analogue to mass (which determines an object's resistance to linear acceleration). The moments of inertia of a mass have units of dimension ML 2 ( [mass] × [length] 2).