Fallen cliff debris
Colour-coded plot showing the number and size distribution of boulders at the bottom of the Aswan cliff in the Seth region of Comet 67P/Churyumov-Gerasimenko before and after a large section collapsed on 10 July 2015. Significantly more smaller boulders are identified than larger pieces of debris.
More information: Collapsing cliff reveals comet's interior
Credit: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA; Pajola et al. (2017)