Final answer:
Dark energy and dark matter dominate the mass-energy content of the universe, with ordinary matter playing a minor role.
Explanation:
Dark energy accounts for the majority of the mass in the universe, making up about 70% of the matter-energy. Dark matter represents about 25% of the energy density, interacting primarily through gravity.
Ordinary matter (protons and neutrons) contributes only 4.9% to the total density. Dark energy's negative gravitational effect is responsible for the acceleration of the universe's expansion.
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