| 21. | It is the home of the Jet Propulsion Laboratory of NASA.
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| 22. | The main innovations were triple turrets and turbo-electric propulsion.
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| 23. | Ship propulsion was improving but was also taking time to develop.
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| 24. | The passive satellite will not carry any communications or propulsion systems.
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| 25. | Two sets of thrusters comprise the observatory's propulsion system.
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| 26. | The solar electric propulsion will be used for the cruise phase.
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| 27. | Their propulsion was slightly different from the previous sub-classes.
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| 28. | The laboratory demonstrated the feasibility and value of nuclear rocket propulsion.
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| 29. | Jet Propulsion Laboratory initially favored its WAC Corporal despite its inadequacy.
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| 30. | Heim was to assist them with their gravity control propulsion project.
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