What the definition of dark energy?
Energy that humans cannot observe directly
Energy that has a small effect on the universe
Energy characterized by black and dark gray colors
Energy that is only emitted by glowing nebulae.
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The first option, "Energy that humans cannot observe directly," is the closest definition of dark energy. Dark energy refers to a hypothetical form of energy that is believed to make up the majority of the energy content of the universe. It is currently not directly observable or detectable but is inferred through its gravitational effects on the expansion of the universe.
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