Chris Hadfield, Canadian Space Agency (IMAGE) NASA/Johnson Space Center Caption Canadian Space Agency astronaut Chris Hadfield, Expedition 34 Flight Engineer, is installing Ultra-Sonic Background Noise Test sensors behind a rack in the Destiny laboratory of the International Space Station. These sensors detect high frequency noise levels generated by station hardware and equipment. Credit NASA Usage Restrictions with nasa credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.