The cause of the expansion of the universe is not fully understood, but it is believed to be related to dark energy, the energy in empty space causing the expanding universe to accelerate. Dark energy is thought to drive space apart and overcome the gravitational attraction that would otherwise slow down the expansion. Some scientists have also proposed that black holes may play a role in accelerating the expansion of the universe, by interacting with spacetime in a way that increases their mass and pushes galaxies apart. However, this idea is still speculative and needs more evidence to support it. The expansion of the universe began with the Big Bang, an unimaginably hot and dense point that inflated rapidly and created space, time, matter and energy. Since then, the universe has been cooling down and growing larger at an increasing rate.
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