Why 67P is a funny shape

A number of scientists who worked on the MiARD project have subsequently contributed to a recent paper in the journal Nature that seeks to explain how comet 67P/Churyumov-Gerasimenko got its current shape. See Bilobate comet morphology and internal structure controlled by shear deformation  

A summary in lay person’s language has been provided by ESA.

MiARD project