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inertial upper stage

noun
1.
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.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for inertial upper stage
  • 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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