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Almost all attempts to get a handle on this question have required physicists to artificially extricate themselves from the accelerating universe and imagine viewing it from the outside.

Although the cosmological constant allowed scientists to balance the Einstein field equations again, making them predict an accelerating universe like the one astronomers had observed, the value of the constant didn't make sense.

Similarly, the horizon of an exponentially accelerating universe exhibits a de Sitter temperature.

Instead, what would be needed is a more complete theory of gravity that explains the accelerating Universe.

The theory of the accelerating universe is a work in progress.