ESA astronaut Alexander Gerst and his five colleagues on the International Space Station spend many hours running experiments but their orbital home needs care and attention too. <br /><br />Here Alexander is analysing a water pump in Europe's Columbus laboratory to make sure that it is working correctly. A number of water pumps work continuously to keep the module and its experiments at the correct temperature. Making sure they work well is an unglamorous task but a vital one.<br /><br />Read more about the Blue Dot mission:<br />http://www.esa.int/bluedot
