A physicist knows that gravity is transmitted between two massive bodies, as it is observed to do so.
A physicist believes that the gas separating these is composed of discontinuous atoms/molecules separated by a relatively large volume of empty space, a vacuum (or one of numerous speculative, ‘vacuum-filling’, zero-inertia media).
A physicist therefore believes that somehow it must be possible for gravity to be transmitted through this vacuum (or one of numerous speculative, ‘vacuum-filling’, zero-inertia media) between these bodies.
I also know that gravity is transmitted between two massive bodies, as it is observed to do so.
I also know that the transmission of a force through a vacuum, or zero-inertia ‘empty space’, is not possible, as such a space cannot sustain ‘action and reaction’.
I know that the only possible vehicle for the transmission of gravity are the component atoms of the intervening gases.
I know that the only possible way that these atoms could transmit a force to adjacent atoms is directly by physical contact and by the process of action and reaction.
I therefore conclude that the atomic matter of the gases separating such two masses cannot be discontinuous, and that the only possible vehicle for the transmission of any force is a continuum of atomic matter.