in·ter·plan·e·tar·y

[in-ter-plan-i-ter-ee]
adjective
being or occurring between the planets or between a planet and the sun.

Origin:
1685–95; inter- + planetary

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
interplanetary (ˌɪntəˈplænɪtərɪ, -trɪ) [Click for IPA pronunciation guide]
 
adj
of, relating to, or existing between planets

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Interplanetary has a plethora of syllables.
So is pneumonoultramicroscopicsilicovolcanoconiosis. Does it mean:
(used as a nonsense word by children to express approval or to represent the longest word in English.)
an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.
Etymonline
Word Origin & History

interplanetary
1691, "existing between planets," from inter- + planet. In ref. to travel between planets, attested from 1897.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
When you go to the moon, you are making an interplanetary trip.
The researchers examined the interplanetary gravitational pull found there.
If there were people on board the small interplanetary probe, no doubt they'd
  be popping champagne.
But this would only possible if terrestrial bugs can survive the intense vacuum
  and radiation in interplanetary space.
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