Authors: Alan W McConnachie; Michael J Irwin; Rodrigo A Ibata; John Dubinski; Lawrence M Widrow; Nicolas F Martin; Patrick Côté; Aaron L Dotter; Julio F Navarro; Annette M N Ferguson; Thomas H Puzia; Geraint F Lewis; Arif Babul; Pauline Barmby; Olivier Bienaymé; Scott C Chapman; Robert Cockcroft; Michelle L M Collins; Mark A Fardal; William E Harris; Avon Huxor; A Dougal Mackey; Jorge Peñarrubia; R Michael Rich; Harvey B Richer; Arnaud Siebert; Nial Tanvir; David Valls-Gabaud; Kimberly A Venn Journal: Nature Date: 2009-09-03 Impact factor: 49.962