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Vacuum Energy
The energy that is present even in otherwise empty space. This energy has been measured to exist (in the "Casimir Effect"). Whereas matter causes the expansion of the Universe to slow down, vacuum energy actually causes the expansion to speed up.
Virtual Particle
A particle which cannot be directly detected, but is assumed to exist due to its indirect effects on real particles. Virtual particles can form in pairs from the vacuum of space.
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The fault, dear Brutus,
Is not in our stars,
But in ourselves...