Above our heads – at an altitude of 400 km – floats an impressive mass of some 400 tonnes. This flying giant is not some lost asteroid, but the International Space Station ISS, orbiting around the Earth. The laboratory is continually inhabited by a crew of six astronauts. In December 2010, a Swiss watch – the ZENITH El Primero Striking 10TH – left the Earth on board a Russian Soyuz rocket, launched from the Baikonur Cosmodrome in Kazakhstan. This high-precision chronograph was taken into orbit in the Columbus module by a European astronaut as part of a European Space Agency program.