gravity classification
111Dark star (Newtonian mechanics) — This article is about astronomical objects described by Newtonian mechanics. For the modern concept based on dark matter, see dark star (dark matter). For the modern concept based on dark energy, see dark energy star. A dark star is a theoretical …
112Marine steam engine — Period cut away diagram of a triple expansion steam engine installation, circa 1918 A marine steam engine is a reciprocating steam engine that is used to power a ship or boat. Steam turbines and diesel engines largely replaced reciprocating steam …
113Universe — For other uses, see Universe (disambiguation). Physical cosmology …
114Nuclear thermal rocket — Sketch of nuclear thermal rocket …
115Cooling tower — Natural draft wet cooling hyperboloid towers at Didcot Power Station, UK …
116Petrography — is that branch of petrology which focuses on detailed descriptions of rocks. Someone who studies petrography is called a petrographer. The mineral content and the textural relationships within the rock are described in detail. Petrographic… …
117Cosmology — The Hubble Ultra Deep Field. Every speck of light in this image is an entire galaxy. This is just a small region of a Universe which could contain as many as 200 billion galaxies. Cosmology is the discipline that deals with the nature of the… …
118parallax — parallactic /par euh lak tik/, adj. parallactically, adv. /par euh laks /, n. 1. the apparent displacement of an observed object due to a change in the position of the observer. 2. Astron. the apparent angular displacement of a celestial body due …
119Character mask — Part of a series on Marxism …
120Charles Sanders Peirce —  B …
