Are the planes of solar systems aligned

with the plane of their galaxy?

The orientation of a planetary system orbiting a star depends only on the initial angular

momentum of the clouds of dust and gas from which it formed. Since these small motions are

completely random, the resulting planetary system can have any orientation. The structure of the star’s host galaxy has no bearing at all on how its planetary systems align themselves. Our Solar System, for example, is inclined by about 63° to the plane of the Milky Way.