Top Definition
Travelling between the eight planets in our solar system. We've reached every one by unmanned probes but all we've been able to take a human to is our moon.
NASA is planning to send humans on an Interplanetary Travel mission to Mars by 2020, but it looks like we have too many problems on Earth to deal with first.
by Nick Weiner January 31, 2009
8 Words related to Interplanetary Travel

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