The success probability must be read separately through the Victory Conditions screen. The screen does, however, have the launch-button. Culture needed depending on map size, which makes this path very hard for large empires. Each tree has 5 policies, so in order to win you must have acquired 25 social policies in 5 different policy trees. This screen should show the success probability of the mission but it does not. How do you win Civ 5 Cultural victory is achieved by filling out five trees of social policies and completing the Utopia Project.
This involves an interface issue: when a new component is completed a screen is shown where the component can be installed. This is made more interesting by having the player make choices: the player can build more thrusters to make the ship travel faster and more casings to increase the probability of success for the mission. Beyond the Sword changes this significantly: as in Civilization and Civilization II, it is not enough to just launch the spaceship it must also reach Alpha Centauri before anyone else's does. In vanilla and Warlords it is enough to just build the ship and launch it.
The spaceship consists of the following parts: The Civilization IV Space Race Victory can be achieved by building a spaceship and sending it to Alpha Centauri.
