An Event is an explicit decision presented to the player. There are three choices, each corresponding to a particular ideology. In addition to granting ideology points, each choice confers various positive and negative effects. The base game has two types of events, Galactic events and Colonization events. Galactic events occur at random, affecting the entire civilization or a random planet, while colonization events always occur upon colonizing a new planet and typically have local effects. adds Crisis events, which are complex event chains with significant effects.