It's possible to "de-terraform" a planet to T0 and then re-terraform it, but this takes significantly more money and/or energy than just destroying cities. Destroying every city or village of a planet in the Tribal or Civilization Stage will allow to colonize, but every single city must be destroyed, which is time-consuming in the Tribal stage where many villages dot the map, making the Gravitation Wave Superpower very useful. If a sentient lifeform inhabits any planet in a system, then no planets in that system can be colonized by a different species.Īny creature at or above Tribal Stage blocks colonization of a system. T1 to T3 planets are often already inhabited (but not necessarily with a complete ecosystem).
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