(Encyclopedia) Space Force, United States (USSF), military force that forms a separate service within the U.S. Dept. of the Air Force, est. Dec. 20, 2019, by act of Congress. The head of the Space…
(Encyclopedia) Buchanan, George, 1506–82, Scottish humanist. Educated at St. Andrews and Paris, he became (1536) tutor to James V's illegitimate son James Stuart (later earl of Murray). He was…
(Encyclopedia) HabakkukHabakkukhəbakˈək [key], prophetic book of the Bible. It is a collection of oracles, perhaps three in number, delivered against the backdrop of the Babylonian threat to Judah in…
(Encyclopedia)
CE5
Schematic representation of Kepler's second law: The areas ABF and A′B′F′ are equal and are swept out in equal intervals of time by a planet orbiting around the sun (at F).…
(Encyclopedia)
CE5
Chain reaction: A neutron (n) strikes the uranium nucleus (U-235), causing it to split into fission products A and B and release two neutrons. These neutrons can in turn cause…
(Encyclopedia) dialysisdialysisdīălˈĭsĭs [key], in chemistry, transfer of solute (dissolved solids) across a semipermeable membrane. Strictly speaking, dialysis refers only to the transfer of the…
(Encyclopedia) covenantcovenantkŭvˈənənt [key], agreement entered into voluntarily by two or more parties to do or refrain from doing certain acts. In the Bible and in theology the covenant is the…
(Encyclopedia) spring, in geology, natural flow of water from the ground or from rocks, representing an outlet for the water that has accumulated in permeable rock strata underground. Some of the…
(Encyclopedia) embryo screening, procedure (see genetic testing) in which a single cell is removed from an embryo two or three days after it has been conceived through in vitro fertilization and…
(Encyclopedia) etching, the art of engraving with acid on metal; also the print taken from the metal plate so engraved. In hard-ground etching the plate, usually of copper or zinc, is given a thin…
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