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Science glossary film: Dark energy

Dark energy

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A mysterious energy field present across the entire known Universe, which accounts for 70% of its mass-energy.

A mysterious energy field present across the entire known Universe, which accounts for 70% of its mass-energy. Its existence was suggested to account for unexpected observations, such as the fact that the post-Big Bang expansion of the Universe is accelerating, not slowing down. Something is working against the effects of gravity, and so far dark energy is the best explanation anyone has proposed.

Its existence was suggested to account for unexpected observations, such as the fact that the post-Big Bang expansion of the Universe is accelerating, not slowing down. Something is working against the effects of gravity, and so far dark energy is the best explanation anyone has proposed.

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