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The cosmology of Norse mythology has `` nine homeworlds '' or `` nine realms '' , unified by the world tree Yggdrasil .. nine. Numbers in Norse mythology. world tree. world tree. Yggdrasil. Yggdrasil. Mapping the nine worlds escapes precision because the Poetic Edda often alludes vaguely .. nine. Numbers in Norse mythology. Poetic Edda. Poetic Edda. The Norse creation myth tells how everything came into existence in the gap between fire and ice , and how the gods shaped the homeworld of humans .