Dark Matter is a form of matter that does not emit, absorb, or reflect light, making it invisible and detectable only through its gravitational effects.
It constitutes about 27% of the universe's mass-energy content.
Unlike ordinary matter, dark matter interacts primarily through gravity and possibly through weak interactions, but not through electromagnetic forces.

Dark Energy is a mysterious form of energy that permeates all of space and tends to accelerate the expansion of the universe.
It accounts for about 68% of the universe's mass-energy content.
Dark energy has a constant density and does not clump like matter.

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