Click on "Y rotation" now. We want to rotate our gear wheels around its Y-axis which always happens in case of real world wheels.
A dotted line will appear with the mouse pointer which is telling you to choose the object whose parameter will be affected by that of the presently selected object's parameter. Click on the Star02.
Now select the "Y Rotation" parameter for the Star02 as you did earlier for Star01 (Transform > Rotation > Y Rotation).
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