It miss bulb effect with GS. You reach plastics and buid/buy labs. When it's done, you fill ALL specialists slots in every cities and build science for 8 turns. Because you have settle 1 or 2 academies and saved other GS. After 8 turns, you bulb them at all. It's around ballistic or airport (or rocketry if you are around 1300 - 1400 in science). So you'll have enough science to have satellites, ballistic and robotics. You can have Xcom tech with ratio enders. Last spaceship parts is reach with GS from Hubble, faith and order Tenet 3. Also, strong culture helps a lot to have 2 level 3 tenets, if you went order. So build Ermitage ASAP. Ally with cultural CS. Stock yours great writers for world fair.