What mysterious substance is hypothesized to account for roughly 70% of the universe's energy density due to accelerated expansion?

Answer

Dark energy, a mysterious repulsive force permeating all of space.

The discovery that the universe's expansion is accelerating, contrary to predictions based on gravity alone, mandated the theoretical introduction of a pervasive repulsive influence pervading all of space. This unknown component has been termed dark energy. The critical, high-precision data gathered by the HST from distant observations were essential in quantifying this effect. The measurements strongly suggest that dark energy constitutes approximately 70% of the universe’s total energy density, representing one of the most significant unresolved puzzles in modern physics concerning the ultimate fate and composition of the cosmos.

What mysterious substance is hypothesized to account for roughly 70% of the universe's energy density due to accelerated expansion?

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