@fermatslibrary Surface area of sphere is 4*pi*r^2, the total amount of gravity or electric field from the source is constant, so at a point in the space the gravity g *4pi*r^2 = constant, divide by 4pi*r^2 at both sides , you get inverse square law. You have to assume the total amount is fixed.
@elonmusk@TheChiefNerd Just build data centers along the coast between Sahara desert and Atlantic sea, cheap land, ample sun shine for solar cells, free sea water for cooling and producing fresh water as byproduct. Dust over solar cells can be blown away by autonomous drones patrolling over the cells.