Those are some great photos! The close-up detail is astounding, especially since that comet is so far away in space.
What's funny is how detailed these photos are of an object 251 miles away from earth but photos taken here on earth of Bigfoot are always fuzzy and out of focus.
Patricia, are you familiar with the Skeptics Guide to the Universe podcast? On today's show they discuss the Rosetta Spacecraft and have some very interesting additional details to share.
You can listen to it here: http://hwcdn.libsyn.com/p/d/d/e/ddece0209d65c90e/skepticast2014-08-...
The Rosetta part starts around after the 21 minute mark.