Explainer
What Is Dark Energy?
Dark energy is a name for an observation, not an explanation of it. The observation is that cosmic expansion is speeding up, and the whole question is whether the thing…
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cosmological constant
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Explainer
The vacuum is not empty. It is extremely busy.
Empty space has energy, structure, and consequences you can measure in a laboratory to twelve decimal places. Here is what the quantum vacuum does, what "virtual particles" actually mean, and…
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