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tewnewt t1_jaxtb2v wrote on March 4, 2023 at 10:11 PM

Its all conjecture. Best guesses are neutrinos, or an effect of black holes as the newest.

Anonymous-USA t1_jaxy57q wrote on March 4, 2023 at 10:48 PM

The latter is dark energy, a repulsive force. Dark matter is a gravitationally attractive force — one that can gravitationally lens light (without obscuring it) and hold galaxies together!