 The crucial inductive steps come next. Newton generalizes the result of the moon test to all the other satellites in the solar system: they, too, are held in their orbits by the same force of gravity (Proposition 5). Then (in Proposition 6) Newton concludes that all bodies whatsoever gravitate towards every primary body (including both Saturn and the sun towards Jupiter, for example); moreover, their weights, like those of terrestrial bodies, are proportional to their masses at equal distances from the primary body in  question.[28]  Finally (in Proposition 7), Newton applies the third law of motion to this last result to derive the law of universal gravitation itself: not only do all bodies whatsoever experience inverse-square accelerations (proportional to mass) towards every primary body in the solar system, but the primary bodies themselves experience inverse-square accelerations (proportional to mass) towards every other body (Jupiter towards its moons and all other planets, the earth towards its moon and all other planets, and so  on).[29]  Indeed, Newton here extends this universal conclusion to the parts of all bodies as  well.[30]