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iner'tial up'per stage'




a U.S. two-stage, solid-propellant rocket used to boost a relatively heavy spacecraft from a low earth orbit into a planetary trajectory or an elliptical transfer orbit. Abbr.: IUS Cf. payload assist module.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

inertial systeminescapable

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