inertial upper 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. Abbreviation: IUS Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Depicted above the spacecraft's open cargo bay is the combined inertial upper stage and a tracking and data relay satellite.
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