craters?

• by gemzjames

  cluster of impact craters? can see an inner crater surrounded by an outer larger crater/?

  Posted January 9, 2013 9:41 PM

• by mschwamb scientist, translator

  Those are the blotches that we'd like you to mark. You can learn more about them here
  ~Meg

  Posted January 9, 2013 9:47 PM