Science'Astronauts can't be replaced by robots'To play this audio please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoScienceJessie Wingard05/31/2017May 31, 2017What does it take to command a mission? Jan Wörner, one of the men who nominated Alexander Gerst for the top job, told DW.https://p.dw.com/p/2duSkAdvertisement