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dark energy
noun
A hypothetical form of energy which, it is supposed, is spread uniformly throughout space (and time) and has anti-gravitational properties: it represents a possible mechanism for the cosmological constant, and thus is one of the possible explanations for the current accelerating rate of expansion of the universe; and it is estimated to account for about 74% of the mass-energy of the universe.
Exact(59)
World Science Festival Salon: "Dark Energy: Measuring a Mystery" Dark energy may be the most compelling problem in modern cosmology.
The short answer is 'Dark Energy', but then the obvious next question is "what's dark energy"?
dark energy?
Dark energy doesn't thin out.
What is dark energy?
And dark energy is... ?
No one knows what dark energy is.
Dark energy certainly counts as frontier science.
Dark energy isn't invisible material.
That's what dark energy does, anyway; what dark energy is..
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The Quest dark-energy video was first broadcast in 2008.
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