Modeling of the evolution of a length distribution of fractures on Ryugu. The thermal expansion coefficient and Young modulus values are from Delbo et al. (2022) in Table 2. In this figure, every 10 000-yr step from 0 to 50 000 yr is shown. Dotted curves are the modeled values after 0 to 50 000 yr. Straight blue and black curves are the mapped fracture distributions of Ryugu and Bennu, respectively. The straight yellow curve represents the maximum possible value, that is, the diameter distribution of host boulders on Ryugu.