Asgard

Drawn directly from Norse mythology, Asgard is the home of a full pantheon, including Thor. It is a small, otherdimensional planetoid (its surface area being about the same as the continental United States), whose nature and physics are different from those of planetary bodies in the Earthly dimension. Asgard is not a sphere like the Earth or Moon, but a relatively flat landmass suspended in space. Asgard does not rotate about its axis, nor does it revolve around a sun. Asgard does have intervals of night and day (of undisclosed durations), so some object or force functions as a sun. There is no evidence of changing seasons, however portions of Asgard are in perpetual winter while others are in perpetual summer.

Asgard's gravity apparently radiates from somewhere below it (assuming gravity works there as it does here): there is a "top" and a "bottom" to Asgard. At the edges of Asgard's landmass, a being or object can fall into a void, but some unknown force apparently keeps the edges themselves from eroding. The same force also prevents the bodies of water along Asgard's boundaries from pouring into the void and prevents Asgard's atmosphere from escaping. Asgard has been described as floating on a "Sea of Space." This sea apparently has a surface, one that is navigable by Asgardian ships, which resemble Viking longboats. The exact nature of space in the Asgardian dimension is unknown.