Asteroid belts are an uncolonizable gravity well that often contains resource asteroids such as metal or crystal . These resource ateroids can be captured with certain frigates (colony frigates for the TEC and Advent, and the Jikara Navigator for the Vasari). Although invulnerable, these resource asteroids can be captured by other factions if left unattended.
Asteroid belts cannot be colonized, meaning no tactical structures can be constructed in the gravity well. Only starbases can be constructed. Constructing a starbase will depend greatly on the strategic importance (being connected to a home planet or forming a bottleneck) and resource viability of the asteroid belt (the number of resource asteroids and the extraction rate).