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111flight, history of — ▪ aviation Introduction development of heavier than air flying machines. Important landmarks and events along the way to the invention of the airplane include an understanding of the dynamic reaction of lifting surfaces (or wings), building… …
112Meteor shower — This article is about the falling of meteors. For the TV program, see Meteor Shower (TV series). A meteor shower is a celestial event in which a number of meteors are observed to radiate from one point in the night sky. These meteors are caused… …
113Provisional designation in astronomy — is the naming convention applied to astronomical objects immediately following their discovery. The provisional designation is usually superseded by a permanent designation once a reliable orbit has been calculated. In the case of asteroids, so… …
114Serpent Mound — This article is about the site in the USA. For the one in the UK, see Skelmorlie. Serpent Mound U.S. National Register of Historic Places …
115meteor and meteoroid — ▪ astronomy Introduction respectively, a glowing streak in the sky (meteor) and its cause, which is a relatively small stony or metallic natural object from space (meteoroid) that enters Earth s atmosphere and heats to incandescence. In modern… …
116de Havilland Mosquito — DH.98 Mosquito The Mosquito B Mk XVI ML963 of 571 Squadron this aircraft was lost on an operation to Berlin in April 1945 …
117Swastika — This article is about the symbol. For the town, see Swastika, Ontario. The counter clock swastika to evoke shakti in the decorative Hindu form …
118Douglas DC-8 — DC 8 redirects here. For the earlier, never built piston engined airplane, see Douglas DC 8 (piston airliner). DC 8 …
119Galactic tide — A galactic tide is a tidal force subjected on objects by the gravitational field of a galaxy such as the Milky Way. Particular areas of interest concerning galactic tides include galactic collisions, the disruption of dwarf or satellite galaxies …
120Earth and Space Sciences — ▪ 1996 Introduction GEOLOGY AND GEOCHEMISTRY In 1995 significant developments took place in the realm of geologic mapping, which provides the foundation for the presentation and comparison of data in the Earth sciences. The most important… …
