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The Art of Thor: The Dark World states that the Nine Realms are multi-dimensional:
and sorry for the clickbait of the thread title but it is the only way to get some attention, the Nine Realms are spatio-temporally separated from each other for obvious reasons (They share the same time and physical travel, like through spaceships, between them is possible), so they doesn't qualify as different space-times as per our standards
It also states that from the observatory you can look out over universes:
The Art of Thor states that the Nine Realms are realms of reality:
The Movie Storybook of Avengers states that Asgard is a realm that exists alongside our universe:
A Deluxe Book/Guidebook of Thor states that Jane and Thor were separated by an entire universe:
With these statements we can conclude that each realm is its own universe, or rather that they have a universal size, since unfortunately,
- The only exception being Niflheim/Hel which was only shown to be able to leave and enter through dimensional portals, although I don't know if that's enough to consider it as a separate space-time
- The Gates of Eternity is located at the center of the universe instead of Earth
- Ego is located outside the edge of the known universe, and we can observe nebulae and stars beyond it