| 1. | He was a member of the Society for Studies of Interplanetary Travel.
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| 2. | Yet no other country has the resources even to contemplate interplanetary travel.
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| 3. | Potentially, Helicon Double Layer Thruster plasma based rockets are suitable for interplanetary travel.
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| 4. | They don't even see manned interplanetary travel in the realm of possibility ."
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| 5. | In 1912, Robert Esnault-Pelterie published a lecture on rocket theory and interplanetary travel.
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| 6. | The player occasionally encounters other spacecraft during interstellar and interplanetary travel.
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| 7. | :Well, given the difficulty of interplanetary travel-it's unlikely that aliens would come here.
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| 8. | Interplanetary travel is travel between planets within a single planetary system.
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| 9. | This was the Plymouth Rock of interplanetary travel, you might say.
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| 10. | The main method of interplanetary travel from this time onward is the rocket ship.
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मोबाइल