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killing populations or system improvements), unlike most types of invasion strategies.
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The first reason for this is that sieging, itself, does no "collateral damage" whilst in progress (i.e. Blockade enemy civilian ships to destroy them for dust.To prevent enemies from producing strategic/luxury resources and halve their economic progress.Done right, it let you conquer a system with minimal damage to what is about to become your system.Larger ships, more weapon modules, or some support modules can increase the amount of lost each turn. ℹ️"Hostile" here means either the two empires are at War, or they're in Cold War with the besieger having the "Righteous Fury" Religious automatic law, or they're in Cold War with the defender's system being within the besieger's cultural boundary, or the defender is an always-hostile minor faction like Pirates. While a system is sieged, it can't refill its, send or receive any civilian ships, or produce any strategic or luxury resources for the empire. If a hostile fleet orbits an enemy system with no other enemy fleets distracting them, they automatically lay siege to the system, reducing the system's defensive manpower every turn.