One way or another, whether push or pull, we know for sure that gravity is omnidirectional with identical mathematics.  With PULL, gravity can be seen as a property of matter.  If so, something is wrong.
The Moon, lifting the tides twice-daily, should have fallen into orbital decay, with Earth having pulled it down eons ago.
It is puzzling that physicists are not troubled by the fact that the Moon not only insists on forever lifting the tides, but, adding insult to injury, keeps moving it about 4 cm further away from Earth each year.
Now if instead, we consider gravity as driven by an omnidirectional pressure—a PUSH force, another possibility arises.  We can consider that it is mysteriously infusing energy into the Earth–Moon system, sustaining the Moon’s orbit with the appearance of raising the tides and actually pushing it away from Earth.
Here we can show that push and pull, while being identical in their mathematics, have different outcomes.  With push, gravity is a property of the universe.  If this is true, then gravitation is flowing from an everlasting source, and the Earth/Moon system is one example of many other types of vacuum energy machines in the universe.   — Roy Masters