COLOGNE, GERMANY - MAY 18: Ruth Hemmersbach Head of the Gravitational Biology Section, DLR-CEO Pascale Ehrenfreund, ESA-president Johann-Dietrich Wörner German Chancellor Angela Merkel and the German astronaut Alexander Gerst (L-R) view a moving centrifuge in the DLR-Laboratory for Life Science Experiments during a visit of the European Astronauts Center (EAC) of the European Space Ageny (ESA) on May 18, 2016 in Cologne, Germany. Merkel is visiting the facilities, as well as the nearby German Center for Air and Space Travel (das Deutsche Zentrum fuer Luft- und Raumfahrt, or DLR) in order to promote Germany's participation in ESA's projects, which it sees as important to climate change, energy and agricultural sector research. (Photo by Volker Hartmann/Getty Images)
