All remote forces result from an unbalanced radiant flow. All remote forces follow the inverse distance squared law of shadowing geometry. Shadowing geometry occurs only within a radiant field. Gravity or radiant pressure unbalance does increase in proportion to the amount of shielding with increasing planet diameter and density. Planet diameters do become large enough to stop all opposing flow through the planet.
All objects fall at the same acceleration.
Apparent planetary weight becomes proportional to cross sectional area when all opposing flow is stopped. A common surface gravity limit does exist for these black shadow planets. Matter shielding or apparent weight loss does occur for these black shadow planets. Gravity variations are obscured on planets of black shadow size. Gravity shadowing variations must show a form of directional symmetry.