| 11. | There were several episodes involving space combat between the Interplanetary Space Force and various enemies.
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| 12. | These are injections of energetic electrons, protons, alpha particles into interplanetary space during solar flare eruptions.
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| 13. | Although a hard vacuum, interplanetary space is reducing, because solar wind consists mostly of hydrogen plasma.
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| 14. | Smoke does not appreciably escape into interplanetary space.
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| 15. | The object would head out into interplanetary space, requiring on-board rocketry or an interception to retrieve.
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| 16. | The spacecraft would be given escape velocity to send it on its way to interplanetary space.
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| 17. | Von Braun's passion was interplanetary space flight.
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| 18. | The sparseness of interstellar and interplanetary space results in some unusual chemistry, since H 3 + ion.
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| 19. | Interplanetary space is cold, lonely, and hostile.
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| 20. | Japan is only the third country after the United States and Russia to attempt an interplanetary space mission.
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