https://www.sciencealert.com/scientists-have-found-mysterious-ripples-on-comet-67p-c-g-s-surface
Scientists Have Found Mysterious Ripples on Comet 67P/C-G's Surface : ScienceAlert
Jan 23, 2015 - In an impressive slew of seven separate papers published today in a special issue of the journal Science, researchers have released their initial observations...
comet 67p c g