Excuse me, why are you erroneously depicting cows as having a radius? We all know that cows, like all objects, are actually point singularities of a given mass. Also, the depiction of the ground texture implies friction and an uneven surface, the color of the sky belies the anomalous presence of air resistance, and the cows are anisotropic in their colouration, and cannot act as the perfect blackbodies we all know them to be.