The way I see it:
Everything in the universe: Every object; body, and mass of material
matter; be it terrestrial, celestial, or meandering betwixt and between
is constantly and continually both receiving and emitting radiation.
This radiation flows across space, emanating from hotter objects to
cooler objects: Where adjacent gaseous and fluid materials exchange
heat through convection, and solids exchange heat through conduction.
Everything in the universe is gravitating, falling or settling toward
common centers of mass; due to impulsions from this emanating flow of
radiation; which passes through the least dense, coolest regions of the
deep sky, toward the most dense regions, where it is constantly
condensing into cooler material satellites, planets suns and stars;
increasing their bulk; in accordance with George Louis leSage's
hypothesis of mutual shielding.
The gist of George Lewis leSage's theory of gravity was that he
proposed that the universe was filled with ultra mundane inelastic
particles flying in all directions at tremendous speeds, and that any
two masses of matter mutually shielded each other from a certain number
of impacts coming from their directions; so that the masses were
impelled toward each other; into the shielded shadow zone.
That is why we cannot shield against gravity: Putting something between
gravitating bodies, increases the shielding effect and just makes the
This was how he claimed gravity acted, not by attraction at a distance,
but by the direct impulsion of these particles.
Today we know that the universe is indeed filled with radiation, with
photons making up a small portion of visible light; with the majority
of the "electromagnetic spectrum" consisting of invisible radiation;
all flying around with the speed of light.