Planck 2015 results. I. Overview of products and scientific results

P.A.R Ade, R Adam, N. Aghanim, Y. Akrami, M.I.R. Alves, F. Argüeso, M. Arnaud, F. Arroja, M. Ashdown, J. Aumont, Per Rex Christensen, Pavel Nasselski, Anne Mette Frejsel, Igor Dmitrievich Novikov, Hans Ulrik Nørgaard-Nielsen