Planetary
31Planetary migration — occurs when a planet or other stellar satellite interacts with a disk of gas or planetesimals, resulting in the alteration of the satellite s orbital parameters, especially its semi major axis. The generally accepted theory of planet formation… …
32Planetary protection — is the term used to describe a guiding principle in design of an interplanetary mission that aims to prevent biological contamination of both the target celestial body and the Earth. This principle arises from the scientific need to preserve… …
33Planetary Unfolding — is an album of electronic ambient music by the American musician Michael Stearns.Infobox Album Name = Planetary Unfolding Type = studio Artist = Michael Stearns Released = 1981 Recorded = 1981 Genre = Ambient Length = 52 min Label = Continuum… …
34Planetary Duality — est le second album du groupe américain de death metal technique The Faceless. Il est caractérisé comme « l album de la maturité » du groupe. Unanimement salué par les médias et les sites spécialisés, il dispense un death metal ultra… …
35Planetary phase — is the term used to describe the appearance of the illuminated section of a planet. Like lunar phases, the planetary phase depends on the relative position of the sun, the planet and the observer.As seen from Earth, the inferior planets may… …
36Planetary surface construction — refers to artificial habitats and other structures constructed on the surface of other planets, asteroids, and other heavenly bodies. Planetary surface construction can be divided into three phases or classes, coinciding with a phased schedule… …
37Planetary chauvinism — is a term coined by Isaac Asimov to describe a belief held by certain individuals that human society will be planet based, rather than space based, despite the potential benefits of the latter. It argues that all the benefits of a planet can be… …
38planetary nebula — n. [from its resemblance, when viewed through a telescope, to a PLANET] a glowing, expanding nebula that forms around a collapsing star …
39planetary wave — planetary wave, Meteorology. a strong current of air, 30,000 to 40,000 feet above Earth s surface, that circles Earth in the Northern Hemisphere, flowing generally from west to east …
40Planetary nebula — A planetary nebula is an emission nebula consisting of a glowing shell of gas and plasma formed by certain types of stars when they die. The name originated in the 18th century because of their similarity in appearance to giant planets when… …
