There are planets inside neptune's orbit and planets inside mercury's orbit. however, the interior mass for neptune is (much greater than/approximately the same as/much less than) the interior mass of mercury. neptune is (much closer to/much farther from/about the same distance from) the sun as/than mercury. therefore the gravitational force exerted on neptune is (stronger/weaker/about the same strength) as/than the force exerted on mercury. as a result, neptune has an orbital (much slower/much faster/about the same speed) as/than the orbital speed that is speed of mercury