Mass m is moving respect to Light in vacuum
we can observe different radiation if mass m surface has got different shape back and front ( EM preasure work on mass M surface. If mass m shape is is different (front/rear ) we can observe and register diferent AERODINAMIC effect )
WE CAN USE EM PREASURE and we can fly !!
we only need measure where in universe we have lower and higher EM preasure .