Fig. 6: The thermal fractures on Dimorphos’ boulders are shallow.

Time to break up t_B,z (in units of million years, Myr) as a function of rock size D. These results are obtained by scaling the results for ordinary chondrites from ref. ^1,11. to the rotation period (P) and orbit of the Didymos system (“Methods” section). We adopt the material properties in Table 1.