Shouldn't Robotics be more of a priority, at least over Advanced Ballistics? Spaceship factories double production on spaceship parts after all, and that would be useful to have in at least a couple of your cities before you build the SS Boosters. That was my logic anyway.
you get atomic theory and nuclear plants (rush in cap/hubble city) on the way to ballistics. rushing robotics afterwards doesn't take too long and you're gonna buy spaceship factories in time for the parts (max 2, you get one with hubble and don't need more than 2 or 3 cities producing parts). this is why i lay off robotics for a while.