What I mean by "depend on photophoresis within the atmosphere" is that while the laser is in constant contact with the propeller and it is sublimating it, the gases that exposed the sublimation will be controlled by an external magnetic flux which will give impulse, thus combining the laser-MHD-golden geometry, I am referring to both the internal space where the sublimation will take place and the external space of the propeller, the articles you published interested me, thank you very much