What force is theorized to be a property of space itself, causing the accelerating expansion of the universe?
Answer
Dark energy
Dark energy is the hypothesized component of the cosmos responsible for the observed phenomenon that the universe's expansion is not merely occurring, but is actively speeding up over time. It is conceptualized as a pervasive property of space itself, which exerts a type of negative pressure that acts repulsively, pushing distant structures farther apart. Although its effect is negligible on local scales like solar systems or even galaxy clusters, it becomes the dominant factor governing the separation of structures across the vast voids of the universe.
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What Force Binds A Galaxy Together? - Physics Frontier - YouTube
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