Surface temperature cycle’s responses of different regolith properties. (a) Surface temperature during a rotation period for: only regolith (black), only norite bedrock (green), and bedrock covered by 1l_s of regolith (orange). (b) Blue line and left ordinate: Surface temperature excursions divided by the excursion of the regolith-only case (95.2 K) as a function of H/l_s. Red line and right ordinate: Normalized κ for different H/l_s to obtain the same ∆T as the regolith-only case. (c) Temperature in depth for the regolith-only case. (d) Temperature in depth for a case that norite bedrock is covered with 2l_s of standard regolith.