So let us now think about our Solar Sytem. Particularly the Sun and our Earth.
Imagine a straight line drawn from the centre of the Sun to the centre of our Earth.
This straight line is of course the fixed straight line medium that energy travels through to reach our Earth.
Whether it be:
A straight line of darkness that energy in the form light can travel through from the Sun to our Earth.
A straight line of coldness that energy in the form of heat can travel through from the Sun to our Earth.
Or perhaps more importantly, a straight line of gravitation that energy in the form of levitation can travel through from the Sun to our Earth.
Energy in various forms travel as a wave from the Sun to our Earth. This energy heats and lights up our Earth as well as lifts up and levitates the Earth around the Sun.
At no stage does the medium line whether it be a straight line of silence, darkness, coldness or a straight line of gravitation cause any sort of 'force' on the various forms of energy waves coming from the Sun.
The straight line medium is inanimate, it contains ZERO energy.