Smoke me a kipper, I'll be back for breakfast

The base-game finish: launch a rocket. Research the tech tree up to the Rocket Silo (you'll need all six base sciences), build the silo, feed it rocket parts and launch. That's "winning" the base game and it triggers the victory screen. In a Space Age game the rocket is an early stepping-stone off Nauvis instead of the ending - the Space Age finish is Second star to the right and straight on till morning..