The rate of expansion of the universe is accelerating across the cosmos, driven by a mysterious force known as dark energy — but maybe not at the edges of black holes, new research suggests. 

Rather than implying that dark energy doesn't act at the boundaries of black holes, this idea suggests that this mysterious universe-dominating force is the only energy at play at event horizons.

The concept may help solve a longstanding problem in cosmology called the "Hubble tension," which arises from radically different estimations of the universe's rate of expansion, known as the Hubble constant, or the Hubble parameter. 

Perhaps even more significantly to non-theoretical physicists, this research means that black holes, their outer boundaries, or "event horizons," and the dark energy-driven expansion of space could all be stranger and tougher to understand than we feared.

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