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...nt in [[Spacetime|space]] that contains energy can be thought of as having mass to create particles. [[Virtual particles]] spontaneously flash into existen ...ifference (if any) between [[Mass#Inertial mass|inertial and gravitational mass]],<ref name="Haisch et al. 1994">See {{harvp|Haisch|Rueda|Puthoff|1994}} fo ...