Actually, Rocket Science is just an application of Newton's Three Laws and the Law of Gravity. Basic Physics.
Rocket Engineering, on the other hand, involves Physics, Mechanical Engineering, Chemical Engineering, Electrical Engineering and countless other fields of knowledge.
As tdent pointed out to me, all engineering is really just applied science. What I meant to say was that the purely scientific part, understanding how a rocket behaves, is more or less basic ballistics. Things don't get unbelievably complex and complicated until you go to design the rockets for the real world.
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