gravity-collapse structure
111History of structural engineering — The history of structural engineering dates back to at least 2700 BC when the step pyramid for Pharaoh Djoser was built by Imhotep, the first engineer in history known by name. Pyramids were the most common major structures built by ancient… …
112Big Bang — This article is about the cosmological model. For the sitcom, see The Big Bang Theory. For other uses, see Big Bang (disambiguation) …
113Main sequence — A Hertzsprung Russell diagram plots the actual brightness (or absolute magnitude) of a star against its color index (represented as B V). The main sequence is visible as a prominent diagonal band that runs from the upper left to the lower right.… …
114CoDominium — The fictional CoDominium universe is a future history (now alternate history) setting for the books in the CoDominium Series by Jerry Pournelle. The CoDominium series* A Spaceship for the King (1973) (later expanded as King David s Spaceship ) *… …
115Aircraft flight control systems — consist of flight control surfaces, the respective cockpit controls, connecting linkages, and the necessary operating mechanisms to control an aircraft s direction in flight. Aircraft engine controls are also considered as flight controls as they …
116Flatness problem — The local geometry of the universe is determined by whether the relative density Ω is less than, equal to or greater than 1. From top to bottom: a spherical universe with greater than critical density (Ω>1, k>0); a hyperbolic, underdense… …
117Mars — /mahrz/, n. 1. the ancient Roman god of war and agriculture, identified with the Greek god Ares. 2. Astron. the planet fourth in order from the sun, having a diameter of 4222 miles (6794 km), a mean distance from the sun of 141.6 million miles… …
118wood — wood1 woodless, adj. /wood/, n. 1. the hard, fibrous substance composing most of the stem and branches of a tree or shrub, and lying beneath the bark; the xylem. 2. the trunks or main stems of trees as suitable for architectural and other… …
119Wood — /wood/, n. 1. Grant, 1892 1942, U.S. painter. 2. Leonard, 1860 1927, U.S. military doctor and political administrator. * * * I Hard, fibrous material formed by the accumulation of secondary xylem produced by the vascular cambium. It is the… …
120Géologie de la planète Mars — La géologie de la planète Mars, parfois appelée aréologie[1], recouvre l étude scientifique de Mars et de ses propriétés physiques, de ses reliefs, de sa composition, de son histoire, et de tous les phénomènes qui ont affecté ou affectent encore… …
