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There is more information available on this subject at Antimatter on the English Wikipedia.

Antimatter is the physical counterpart to matter. Antimatter consists of antiparticles which have the same mass as their matter counterparts but with a reversed charge. Antimatter annihilates upon contact with matter.

The Covenant use antimatter as a reactant in ordnance, namely antimatter charges. These charges were used in the Battle over Installation 04[1] and to destroy Athens Station, Malta Station, and nearly Cairo Station in the Battle for Earth.[2]

Certain Forerunner weapons use antimatter as well; the Z-390 incineration cannon, for example, fires antimatter embedded within streams of energized particles.[3] Converging beam cannons of the Sojourner-class dreadnought created paths for antimatter to pursue enemy starships.[4]

The UNSC has placed an antimatter production facility on Mercury,[5] and antimatter weapon weilded UNSC frigates made their appearance after Covenant war.[citation needed]

Sources

  1. ^ Halo: Combat Evolved, campaign level The Pillar of Autumn
  2. ^ Halo 2, campaign level Cairo Station
  3. ^ Halo 4: The Essential Visual Guide, page 101
  4. ^ Halo: Warfleet, page 80-81
  5. ^ Halo Mythos, The Interplanetary War, p. 51