An earthquake is the result of a sudden release of energy in the Earth's crust that creates seismic waves. The seismicity or seismic activity of an area refers to the frequency, type and size of earthquakes experienced over a period of time. Earthquakes are measured with a seismometer; a device which also records is known as a seismograph. The moment magnitude (or the related and mostly obsolete Richter magnitude) of an earthquake is conventionally reported, with magnitude 3 or lower earthquakes being mostly imperceptible and magnitude 7 causing serious damage over large areas. Intensity of shaking is measured on the modified Mercalli scale. Earthquake is also the stage name of a hip-hop DJ. He performed with Vanilla Ice in a Brooklyn night club in the 1991 film Teenage Mutant Ninja Turtles II: The Secret of the Ooze.
An Emperor is the supreme leader of a monarchy or sovereign nation or Empire. The title is equal to that of a King or Queen, but does not necessarily require one to be of royal ancestry. In a republican-based governmental system, the Emperor holds court over a congress or senate and is encouraged to concede to the judgment of his constituents. In other such systems however, no such entity exists and an Emperor may conduct authoritative control over his Empire with impunity. In science fiction, there have been several notable fictional Emperors including Emperor Palpatine from the Star Wars film franchise, Emperor Gowron of the Klingon Empire as seen in Star Trek and Padisha Emperor Shaddam IV from the Dune franchise.
(See Also: Empress)
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An ensign is a distinguishing flag of a ship or a military unit; or a distinguishing token, emblem, or badge, such as a symbol of office. The word has also given rise to the military rank of "ensign", a rank of junior officer once responsible for bearing the ensign of his unit.
Entomology is the study of insects. Like several of the other fields that are categorized within zoology, entomology is a taxon-based category; any form of scientific study in which there is a focus on insect related inquiries is, by definition, entomology. Insects account for more than two-thirds of all known organisms on the planet Earth. Those who study entomology are called entomologists.
An EVA pod is a one-person short-range spacecraft specially equipped for extra-vehicular activity. EVA pods may serve multiple functions, but primarily they are used to deploy astronauts on spacewalks and to perform repair and rudimentary maintenance functions on larger space vessels, satellites or space stations.
Evolution is the change in the inherited traits of a population of organisms through successive generations. It is also referred to as biological, organic or genetic evolution. This change results from interactions between processes that introduce variation into a population, and other processes that remove it. As a result, variants with particular traits become more, or less, common. A trait is a particular characteristic—anatomical, biochemical or behavioural—that is the result of gene–environment interaction
An exoskeleton is an external skeleton that supports and protects an individual or animal's body, in contrast to the internal skeleton (endoskeleton) of, for example, a human. Many extraterrestrial creatures, such as the animalistic Xenomorph have a natural exoskeleton. There are also those who create artificial exoskeletons to supplement padded, insulated body suits for activity in harsh environments or in combat situations. Artificial exoskeletons differ from body armor in that they are generally modular, interconnected appliaces that do not necessarily cover the entire form of the individual wearing it.
(See Also: Exoskeletons)
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An expansion region is an area of topographical space located either on an inhabited world or in a sector of a known galaxy. Generally these areas are not governed by an established governmental hiearchy and may be largely unexplored. The term is frequently used in the Star Wars mythos and can be frequently found in many of the licensed roleplaying source books and reference guides. In Star Wars, the expansion region is located between the Inner Rim Territories and the Mid Rim area of the Star Wars Galaxy.
(See Also: Mid-Rim; Outer Rim Territories; Inner Rim Territories; Core Worlds; Wild Space)
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Explosive decompression is the result of an unexpected drastic alteration of pressure within a sealed system. It occurs when the speed of decompression occurs faster than air can escape from the lungs. There are numerous examples of explosive decompression found in science fiction and usually occurs when a body is submered at unsafe levels below sea level, or when a body is exposed to the vaccum of outer space. Examples of this has been found in films such as 2001: A Space Odyssey, Star Trek: Nemesis and Event Horizon.
Extrasensory perception (ESP) involves reception of information not gained through the recognized physical senses but sensed with the mind. The term was coined by Sir Richard Burton, and adopted by Duke University psychologist J. B. Rhine to denote psychic abilities such as telepathy and clairvoyance, and their trans-temporal operation as precognition or retrocognition. ESP is also sometimes casually referred to as a sixth sense, gut instinct or hunch, which are historical English idioms. The term implies acquisition of information by means external to the basic limiting assumptions of science, such as that organisms can only receive information from the past to the present.
Extraterrestrial refers to any object or organism which is not native to the planet Earth. In most cases, this refers to alien life forms. The term became a part of modern parlance in 1982 with the release of Steven Spielberg's E.T. the Extra-Terrestrial.
(See Also: Alien; E.T.)
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