perturbed motion
71Mössbauer effect — Physics. the phenomenon in which an atom in a crystal undergoes no recoil when emitting a gamma ray, giving all the emitted energy to the gamma ray, resulting in a sharply defined wavelength. [1955 60; named after R. MÖSSBAUER] * * * ▪ physics… …
72electrochemical reaction — ▪ chemistry Introduction any process either caused or accompanied by the passage of an electric current and involving in most cases the transfer of electrons between two substances one a solid and the other a liquid. Under ordinary… …
73Comet Shoemaker–Levy 9 — D/1993 F2 (Shoemaker–Levy) Image of Comet Shoemaker–Levy 9 fragments (total: 21), taken on May 17, 1994 Discovery Discovered by: Carolyn Shoemaker Eugene M. Shoemaker David Levy Discovery date …
74Van de Kamp , Peter — (1901–) Dutch–American astronomer Van de Kamp, who was born at Kampen in the Netherlands, studied at the University of Utrecht, obtaining his PhD in 1922. He emigrated to America in 1923 and, after appointments at the Lick Observatory (1924–25)… …
75Perturbation — Per tur*ba tion, n. [L. perturbatio: cf. F. perturbation.] 1. The act of perturbing, or the state of being perturbed; esp., agitation of mind. [1913 Webster] 2. (Astron.) A disturbance in the regular elliptic or other motion of a heavenly body,… …
76Solar System — This article is about the Sun and its planetary system. For other systems, see planetary system and star system. For a list of physical and orbital statistics for the Solar System s largest bodies, see List of gravitationally rounded objects of… …
77Halley's Comet — For the video game, see Halley s Comet (video game). 1P/Halley (Halley s Comet) Halley s Comet on March 8, 1986 Discovery …
78Yarkovsky effect — The Yarkovsky effect is a force acting on a rotating body in space caused by the anisotropic emission of thermal photons, which carry momentum. It is usually considered in relation to meteoroids or small asteroids (about 10 cm to 10 km in… …
79Langmuir probe — A Langmuir probe is a device named after Nobel Prize winning physicist Irving Langmuir, used to determine the electron temperature, electron density, and electric potential of a plasma. It works by inserting one or more electrodes into a plasma,… …
80Geomagnetic storm — This article is about disturbances within Earth s magnetosphere. For other uses of magnetic storm , see Magnetic storm (disambiguation). Solar particles interact with Earth s magnetosphere. A geomagnetic storm is a temporary disturbance of the… …
