Bases on the moon and Mars could help preserve human civilization and hasten its regeneration on earth in the event of a third world war, billionaire entrepreneur Elon Musk, said on Sunday.Musk, the founder of rocket and spacecraft company SpaceX, said the company`s interplanetary ship could begin test flights as soon as next year.There is "some probability" that there will be another Dark Ages, "particularly if there is a third world war," Musk said at the SXSW conference."We want to make sure that there`s enough of a seed of human civilization somewhere else to bring civilization back, and perhaps shorten the length of the Dark Ages," he said."I think a moon base and a Mars base that could perhaps help regenerate life back here on earth would be really important."Musk said he thinks that SpaceX`s interplanetary ship will "be able to do short flights, short sort of up and down flights, probably sometime in the first half of next year."SpaceX launched the world`s most powerful rocket, the Falcon Heavy, last month, sending Musk`s red Tesla Roadster car toward an orbit near Mars.