neptune also has similarities with uranus in its magnetosphere. however, uranus' magnetosphere is weaker than neptune's magnetosphere. the magnetic field is strongly tilted compared to its rotational axis at 47°. it is offset at least 0.55 radii (about 13,500 kilometres, bigger than the earth's diameter, for scale) from the planet's physical center. the unusual course may be caused by flows in the interior of the planet.