[Errant]

Problem is, to push it depends on some sort of as-yet undetected “ether”.

I don't know.

It seems electromagnet force does, but not gravity, for its effect is not affected by the accumulation of itself... :)

[cuban leaf]

Funny you should mention EM force...

http://www.amazon.com/Pushing-Gravity-Perspectives-Theory-Gravitation/dp/0968368972

[UCANSEE2]

Problem is, to push it depends on some sort of as-yet undetected “ether”.

Like quantum foam. The ground floor of atomic movement? The "ohmmmmmmmmm' that God continuously utters that is the basis for the existence of matter and energy?