Matter is the general term for all physical substances. It consists at the basic level from charged subatomic particles. There is also a variant of matter where the particles have the same mass and configuration, but an opposite charge: antimatter. These variants react heavily with each other, canceling each other out in a matter-antimatter reaction. This kind of reaction is widely used to propel starships.
See also:
- states of matter
- antimatter
- atoms
- dark matter
- energy
- protomatter