| 11. | Thus, several techniques have been devised to reduce the fuel requirements of interplanetary travel.
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| 12. | Interplanetary travel, however, appears to come with a price tag.
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| 13. | The station also would test interplanetary travel gear, including water-and air-recycling systems and space robots.
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| 14. | Its universe was limited to the solar system, and revolved heavily around interplanetary travel and terraforming.
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| 15. | A later version published in 1934 included details on interplanetary travel and applications of nuclear power.
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| 16. | No-I most certainly don't believe that interplanetary travel is easy . . . it's ridiculously difficult.
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| 17. | "' Interplanetary spaceflight "'or "'interplanetary travel "'is travel between planets, usually within a single planetary system.
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| 18. | Beginning in 1957, coinciding with the space race, Forner's attention turned to imagined scenes of interplanetary travel.
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| 19. | This fact is used in interplanetary travel.
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| 20. | A minimum-fuel Hohmann transfer orbit would take 146 days . See also our article on interplanetary travel.
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