Weighing the implications of negative-mass antimatter

By Tom Siegfried, 17:54 PM September 24, 2013

Antimatter is anti- a lot of things, but it’s not supposed to be antigravity.

An antimatter particle does have the opposite electric charge of its ordinary matter counterpart. But the mass of both particles should be precisely equal. When an antiparticle meets its ordinary particle partner, they annihilate in a burst of energy, equal to their masses squared in accordance with Einstein’s famous formula E=mc2.

Because you get energy out by destroying antimatter, you have to put energy in to creat...

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