Would the effective mass and gravity of each shell combine into one gravity field at the surface of the outer sphere with complete zero g throughout the entire inside the largest sphere regardless of mass or masses inside... or would each sphere have its own separate gravity field on the exterior of each shell with a zero g section in between and in the center of the smallest sphere? Something else?
I understand that in a hollow sphere, all the internal points experience no gravity and only the surface outward from said sphere has gravity... but where I get confused conceptually is what if there is one or more objects massive enough to have its' own gravity inside said sphere.
I ask this question because I was randomly wondering one day if somehow a Dyson sphere suddenly appeared out of nowhere enclosing the Earth and the Sun... would everything inside suddenly go to zero g, and what would that mean for the structural forms and atmospheres and lifeforms of the planets and sun inside? Anyway, I am trying to make this a simpler question, so this paragraph is simply explaining why I'm asking and is not intended to be a question itself.
For the purposes of this theoretical question, assume three shells of 0.7AU, 1AU, 1.3 AU starting off perfectly aligned, each shell contains enough mass that if place independently of each other they would have 1g at the exterior surface, with nothing in the center, and without other influences. How this was constructed is irrelevant to the best answer. If my numbers make no sense, feel free to adjust them to something more realistic.
You are welcome to show your math if you choose, but please also provide a layman's explanation.