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Definitions (383)
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walking orbit
An orbit in which gravitational influences are used to induce a precession in a satellite's orbital plane.
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back-up
An item kept available to replace an item which fails to perform satisfactorily.
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ballistics
The science that deals with the motion, behavior, appearance or modification of missiles acted upon by propellants, rifling, wind, gravity, temperature or other modifying conditions of force.
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bar
A unit of pressure equal to one million dynes per square centimeter, or 0.99 atmospheres.
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basin
A large, >200 km, circular depression from the explosive impact of an asteroid or similar sized body on a planet surface, usually rimmed by mountains.
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bi-propellant
A rocket propellant consisting of two unmixed or uncombined chemicals (fuel and oxidizer) fed separately into the combustion chamber.
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binary star
Two stars revolving around a common center of gravity.
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bit
A basic unit of computer information; abbreviation of binary digit.
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black powder
A mixture of saltpeter (potassium nitrate), sulfur, and charcoal, used in explosives and as an early propellant for rockets.
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blackout
A temporary loss of radio communications which occurs between a spacecraft reentering the atmosphere and ground stations due to an ionized sheath of plasma which develops around the vehicle.
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