German Astronaut Alexander Gerst Aboard The International Space Station

IN SPACE - SEPTEMBER 18: (EDITORIAL USE ONLY) In this handout photo provided by the European Space Agency (ESA) on SEPTEMBER 18, 2014, German ESA astronaut Alexander Gerst took this image of a sandstorm over the Sahara desert in whilst aboard the International Space Station (ISS). Gerst returned to earth on November 10, 2014 after spending six months on the International Space Station completing an extensive scientific programme, known as the 'Blue Dot' mission (after astronomer Carl Sagan's description of Earth, as seen on a photograph taken by the Voyager probe from six billion kilometres away). (Photo by Alexander Gerst / ESA via Getty Images)