A Civilization advance.
During World War II, military researchers found a way to turn an ancient Chinese curiosity into a practical long-range weapon. Rocketry is the development of projectiles propelled by the ejection of gases heated (and often generated) by the combustion of on-board fuel. With the realization that Newton's Second Law of Motion applied even in a vacuum, nations began using rockets to propel spacecraft and weapons with global range.
Prerequisites: Advanced Flight and Electronics.
Allows for: Space Flight

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