1Cosmos IncognitiINTRODUCING THE MULTIVERSE
Recall the maps of old where less-than-intrepid mapmakers marked unexplored territory with the words terra incognita: unknown land. This boundary, usually indistinct, marked the known frontier and separated it from the unexplored—that which was beyond our knowledge. Recall also that apprehensive phrase “Here be dragons” accompanied by drawings of fearsome beasts thought perhaps to inhabit such territories, providing a clear warning (or at least an expression of doubt and fear) of what lies beyond. It is hard to imagine such a need today, so thoroughly have we explored the earth and mapped it out (save perhaps the deep, dark depths of the sea, where—who knows?—fearsome creatures may still prowl).
A frontier ...
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