Antimatter vs. Other Resources:
Unlike Helium-3 and Mineral Ore, Antimatter cannot be harvested from resource asteroids or produced in your base. The Antimatter Silos in your base only serve as storage for the Antimatter you collect elsewhere.

How to Collect Antimatter:
The primary way to gather Antimatter is by targeting specific cargo fleets:

• On the Planet Map, look for purple Antimatter Cargo fleets that spawn around Alien Artifacts. These fleets carry only Antimatter.
• On the Sector Map, most VEGA Cargo fleets typically carry a mix of Antimatter, Helium-3, and Mineral Ore.

Alternative Antimatter Sources:
If you're feeling bold, you can also attack other players and steal the Antimatter they’ve collected!