"Interplanetary travel" refers to the act of journeying or traveling between different planets within our solar system, like going from Earth to Mars or Jupiter. Full definition
As such, I think it might also appeal to fantasy fans who don't mind a few aeroplanes and a spot of interplanetary travel in their fiction. (bookofdeacon.com)
While it may be true that Morphite takes some inspirations from NMS, Morphite attempts to do more with procedurally generated interplanetary travel. (ninmobilenews.com)
Either way, in order to increase humanity's chances of survival, Musk is taking a decidedly proactive stance in championing interplanetary travel. (entrepreneur.com)