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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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  • Inertly

    [in-urt, ih-nurt] /ɪnˈɜrt, ɪˈnɜrt/ adjective 1. having no inherent power of action, motion, or resistance (opposed to ): inert matter. 2. Chemistry. having little or no ability to react, as nitrogen that occurs uncombined in the atmosphere. 3. Pharmacology. having no pharmacological action, as the excipient of a pill. 4. inactive or sluggish by habit […]

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