Planet is what the living organism that dominates the planet is called. In earlier scripts it was called Chiron. Its fungus acts as a giant brain. It can control all forms of native life, using them to attack any who upset it. It begins to speak to the colonist after a certain time period, and gains understanding of them over time. Planet as a Society Effect(link) represents your society's sensitivity to the ecology of Planet(link). A low score indicates that ecological damage will occur more quickly. A high score allows you to capture native life such as mind worms(link).