Why travel to the Moon or Mars if we only continue our wars there with Russia or China or Africa? Why build rockets at all? For fun? For adventure? Or is this the same process that sends the salmons back upstream year after year to spawn and die - a subliminal urge in mankind to spread, in self-preservation, to the stars? Are we then secretly fearful that one day the sun might freeze and the the earth grow cold or the sun explode in a terrific thermal cataclysm and burn down our house of cards?