When a rocket is launched towards X direction in the space its exhaust will be spayed towards -X direction .
None will doubt it.
But excause me, the diffusion angle of the exhaust is not zero at all!
The temperature of the space is about -270℃, those gas molecules scattered and moving around will be cooled into liquid and then become frozen graduately.
Will all of the Solidified bodies move towards -X direction forver? Never escapes towards Y,-Y,Z,-Z……directions?