Mr Mach worked in past on very universal model
gravitation relation for all masses in the universe

m

Mach trusted that if You pushing mass m You feel not mass m but you feel all others masses in space ( between mass m and all others masses exist gravitation )


to build his model at first he would like to use absolute motion definition ( please compare far far star signal and einstein )




Mr Mach Supersonic airplane ???

I started think how will look mass M and where will be gravitation if mass M will escape from own singnal
( airplane can escape from sound -I Mach speed )