ROUGH CUT (No reporter narration)<br/> <br />Two Russian cosmonauts floated outside the International Space Station on Wednesday (October 22) for a six-hour spacewalk to replace science experiments and jettison two unneeded antennas.<br/> <br />Station commander Maxim Suraev and flight engineer Alexander Samokutyaev left the station's Pirs airlock at 9:28 a.m. EDT/1328 GMT as the complex sailed 260 miles (418 km) above the planet.<br/> <br />The cosmonauts quickly completed the first task on their to-do list: removing and jettisoning a defunct science experiment known as Radiometriya.<br/> <br />The device, which was installed in 2011, was used to track seismic activity on Earth, NASA mission commentator Rob Navias during a live broadcast of the spacewalk on NASA TV.<br/> <br />Suraev and Samokutyaev then moved on to remove a protective cover from a European science experiment that exposes organic and biological samples to the harsh environment of space.<br/> <br />The cosmonauts, both of whom were making their sec
