It may look like a boulder that someone has decorated with blobs of plaster of Paris, but this is two-mile-wide comet 67P.  As of today, this agglomeration of ice and rock – a left-over from the hordes of similar objects that formed Earth and the other planets – is now the graveyard of the European Rosetta spacecraft.  After a twelve-year mission, that remarkable craft was deliberately crashed into the comet on September 30, 2016.  In some sense, you could say that the human inhabitants from a world created four billion years ago by cousins of this comet had returned, if only with their technology and their curiosity. For more images visit http://blogs.esa.int/rosetta/2015/06/11/the-quest-to-find-philae-2/