  ==Sphere-cone paragraph==  ~~MV~~  It is mentioned in this paragraph that the MK-2 Rv used a radiatively cooled TPS based upon a metallic heat shield, but the Mk-2 used the heat-sink concept. It seems that unlike the ablative or thermal soak TPS, the heat-sink does not work as a heat shield, it only conducts the heat away form the shell of the RV. Was the mention of a metallic heatshield referring to the heatsink or does the heatsink concept also have a heatshield besides the copper heatsink?