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Science, Evolution, and Creationism, by the National Academies, focuses on teaching evolution in today's classrooms. Check out the other publications in our online store.
Detail of a memorial stone, dated from about A.D. 500, found during the restoration of a church at Sanda in Gotland. The tree at the center of it symbolizes the Viking concept of the universe.
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Image reproduced by courtesy of Gotlands Fornsal, Visby.

Midgard

Midgard is the realm where humans live, the Earth. It was created when the god Odin and his brothers Vili and Ve slayed the giant Ymir. In Norse mythology, the world was seen as a gigantic tree, called the World Tree or Yggdrasil, around which existed nine realms, each at a different level. The roots supported the tree and its branches shaded the world.

The roots of the tree reached down into the underworld. On the surface, Midgard is surrounded by a giant serpent. Bifrost is a huge bridge connecting Midgard to Asgard, the home of the gods.

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF