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The exact opposite of matter, antimatter, has been known to exist for decades now, although how it behaves in the presence of a gravitational field remains mostly unknown even though countless experiments have been conducted over the years. Each particle described in the Standard Model has its own antiparticle counterpart, having similar mass and spin, albeit opposite charge. For example, the electron has as antiparticle the positron, which is a lepton with mass similar to that of the electron, ... Read »