How are the bubble universes predicted by eternal inflation separated from one another?

Answer

They are forever separated as the space between them expands indefinitely faster than light.

The theory of eternal inflation posits that the expansion continues in regions outside our bubble. The space between these localized, slowed inflation areas continues to expand without limit, moving the bubble universes away from each other faster than light, making contact impossible.

How are the bubble universes predicted by eternal inflation separated from one another?

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