** Europe tells US: 'Come to Europa' ** The European space agency asks its US counterpart to join it on a mission to Europa, the ice-crusted moon of Jupiter. < http://news.bbc.co.uk/go/em/fr/-/1/hi/sci/tech/4347571.stm<http://news.bbc.co.uk/go/em/fr/-/1/hi/sci/tech/4347571.stm> >