13 Answers Antimatter shares many properties with ordinary matter. Antiparticles have the same masses as their matter counterparts, but, Antimatter is made of particles that have an opposite sign to those of matter, so a proton is positively charged, whereas, its antimatter equivalent is called antiproton, which has a negative charge, they both fall in a gravitational field. So yes, antimatter is a sort of matter. It is still confusing to scientists why there is so much matter and so little antimatter in the universe, since they must be made in equal quantities in high-energy interactions. Like the Big Bang (Pairs of matter and antimatter particles can be generated from big concentrations of energy. This is what happened during the Big Bang, an explosion so intense that generated matter and antimatter where there only were immense quantities of energy.)