Evidence of dune-like structures in the surface dust of Comet 67P/Churyumov–Gerasimenko. Features like this may be the result of localised gas-driven transport of surface dust. The image was taken by the OSIRIS narrow-angle camera on 23 August 2014.
A labelled version of this image is available here.
Credits: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA