Orbital welding — is a specialised area of welding whereby the arc is rotated mechanically through 360° (180 degrees in double up welding) around a static workpiece, an object such as a pipe, in a continuous process. Contents 1 History 2 Equipment 3 Application … Wikipedia
Orbital (métro de Paris) — Arc Express Arc Express Réseau Année d’ouverture estimée à 2020 Exploitant ? Matériel utilisé automatique intégrale Points d’arrêt environ 60 Longueur environ 60 km Distance moyenne entre points d’arrêt 1000 m … Wikipédia en Français
Orbital speed — Not to be confused with Escape Velocity. The orbital speed of a body, generally a planet, a natural satellite, an artificial satellite, or a multiple star, is the speed at which it orbits around the barycenter of a system, usually around a more… … Wikipedia
Soudure à l'arc — Soudage Wikibooks propose un ouvrage abordant ce sujet : Soudage. Le … Wikipédia en Français
Soudage orbital — Le soudage orbital est un procédé de soudage spécial pendant lequel un arc tourne sans interruption à au moins 360° autour d’une pièce fixe (composant cylindrique, tel qu’un tube). Sommaire 1 Histoire du soudage orbital 2 Equipement 3 Application … Wikipédia en Français
C/2010 X1 — For beliefs regarding a supposed collision between Earth and Comet Elenin, see Nibiru collision. C/2010 X1 (Elenin) Comet Elenin as seen by the STEREO B spacecraft on August 1st, 2011. Discovery Discovered by: Leonid Elenin 0.45 m reflector (H15) … Wikipedia
Nemesis (hypothetical star) — Not to be confused with the hypothetical planet Tyche. Artist s conception of Nemesis as a red dwarf seen from a nearby debris field with the Sun visible in the center. Nemesis is a hypothetical hard to detect red dwarf star,[1] white dwarf star … Wikipedia
Marisat — satellites were the first maritime telecommunications satellites and were designed to provide dependable telecommunications for commercial shipping and the U.S Navy from stable geosynchronous orbital locations over the three major ocean regions.… … Wikipedia
Astronomia nova — Johannes Kepler s Astronomia nova , published in 1609, contains the results of the astronomer s ten year long investigation of the motion of Mars. The full title of his work, in English, is New Astronomy, Based upon Causes, or Celestial Physics,… … Wikipedia
Nemesis (star) — Nemesis is a hypothetical red dwarf star or brown dwarf, orbiting the Sun at a distance of about 50,000 to 100,000 AU, somewhat beyond the Oort cloud. The existence of this star was postulated in an attempt to explain an inferred periodicity in… … Wikipedia
