cloud of electrons -
61Magnetosphere of Saturn — Aurorae on the south pole of Saturn as viewed by Hubble Internal field[1 …
62atmosphere, evolution of — Introduction the development of Earth s (Earth) atmosphere across geologic time. The process by which the current atmosphere arose from earlier conditions is complex; however, evidence related to the evolution of Earth s atmosphere, though… …
63Atmosphere of Venus — Atmosphere of Venus …
64electromagnetic radiation — Physics. radiation consisting of electromagnetic waves, including radio waves, infrared, visible light, ultraviolet, x rays, and gamma rays. [1950 55] * * * Energy propagated through free space or through a material medium in the form of… …
65Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …
66Interstellar medium — Interstellar redirects here. For other uses, see Interstellar (disambiguation). The distribution of ionized hydrogen (known by astronomers as H II from old spectroscopic terminology) in the parts of the Galactic interstellar medium visible… …
67Ion — Cation and Anion redirect here. For the particle physics/quantum computing concept, see Anyon. For other uses, see Ion (disambiguation). Hydrogen atom (center) contains a single proton and a single electron. Removal of the electron gives a cation …
68cluster — clusteringly, adv. clustery, adj. /klus teuhr/, n. 1. a number of things of the same kind, growing or held together; a bunch: a cluster of grapes. 2. a group of things or persons close together: There was a cluster of tourists at the gate. 3. U.S …
69Bohr model — In atomic physics, the Bohr model created by Niels Bohr depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus mdash;similar in structure to the solar system, but with… …
70Introduction to quantum mechanics — This article is an accessible, non technical introduction to the subject. For the main encyclopedia article, see Quantum mechanics. Quantum mechanics …
