That is actually a little interesting... if the shield stops solid projectiles like missiles and kinetic rounds then it has to be opaque to solid matter, and if its blocking other primary shots it has to be opaque to the particles that make up the energy shots (photons for laser beams, various ions for particle accellerator guns) Either way if a shield is going to defend against weapons it OUGHT to be pushing the nebula gasses away too. The other confusing thing, now that I think about it... if beams are laser weapons(photon beam cannon) , then if they can block lasers like the Subach they should block beams too.