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Take a trip of a lifetime to visit our neighboring planets with A Traveler's Guide to the Planets. National Geographic takes off beyond Earth's boundaries for the24 May 2017 1 Jul 2017 It is the ultimate in adventure travel, but it is not for the faint of heart. Today's super space traveller must endure drastic climates that shift from 450 degrees A space traveler's guide to exploring the alien mysteries of the planets.