Some satellites use a system of reaction wheels—basically gyroscopes—to change their attitude in space. The rapidly spinning wheels carry a lot of rotational momentum that the spacecraft can tap to change its own orientation. To do this in all three dimensions of space, the spacecraft must use three rotating wheels oriented at right angles to one another.
How Can Thrust Help Change Attitude?
Most spacecraft use small thruster rockets to control their attitude. To rotate a spacecraft, a pair of thruster rockets on opposite sides of the vehicle are fired in opposite directions. To stop the rotation, a second pair is fired to produce an opposing force.