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During inflation, all the mass and energy in
the universe burst forth from the vacuum of space
Heisenberg’s uncertainty principle states that the amount of uncertainty in the mass of a subatomic particle increases as it is observed for shorter and shorter time periods
Because of the uncertainty principle, particle-antiparticle pairs can spontaneously form and disappear within a fraction of a second
These pairs, whose presence can be detected only indirectly, are called virtual pairs