IIRC we're going to need Robotics eventually, in order to get Superconductor.
Plastics requires Refining and Space Flight, while the Laser requires Nuclear Fission and Nuclear Power.
Robotics is off the path for the spaceship.

won't be built in this game), and then add food caravan to put production at 50 shields. Then production is changed to a structural (no loss of shields, as SS parts count as wonders). The next turn, the city adds its 30+ shields and a structural is built.

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