It's easier than rocket science.
From the campaign:
In Rocket Race, each player represents the combined resources of one such League that has taken up the challenge to construct and launch a Moon Rocket!
In order to achieve this magnificent feat you need to assemble a Rocket. Your Rocket must comprise a Steering Mechanism, a Capsule, and a Propulsion System, and you can add Accessories you think might aid your successful moon landing and return to the Earth!