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Q:

Why are there fins on an spacecraft if there is no air in space?

A:

Before they get to space, rockets need to make it out of the atmosphere. Fins are placed on rockets for stability, so that they can fly on the correct path after takeoff. 

 

Rockets rotate around their center of gravity as they fly (torque) and can be made to wobble or shift trajectory with just a gust of wind. The fins are used to keep them on the straight and narrow. 

Categories: Aerodynamics