Copyright © 2015 Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR). ###>About the author The ‘Jan Wörner’ blog was written by Johann-Dietrich ‘Jan’ Wörner during his time as the Chairman of the Executive Board of the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR).