Science VictoryEdit
Main article: Science victory (Civ5)
To achieve a science victory, you must build and launch a spaceship. In order to do this, you need first to complete the Apollo Program project, and then you must reach far enough in the technology tree to be able to build the components of the spaceship. All of the necessary technologies for this are in the Information Era (Modern and Future Eras in vanilla), and require developing practically the entire tech tree.
Once you have all the required components of the spaceship (or as they become available), you can assemble them at your capital. The spaceship will be automatically launched to Alpha Centauri once assembled.
In Brave New World, it appears that the tech development in the later Eras has been considerably slowed (more 20xScience5 Science required for each tech), probably to allow for a longer time to play with all new late-game features introduced in the expansion.