Astronauts upgrade station power system in six-hour spacewalk

By Irene Klotz CAPE CANAVERAL, Fla. (Reuters) - Two astronauts floated outside the International Space Station on Friday for a six-hour spacewalk to replace ageing batteries for the laboratory's solar power system, an upgrade needed to keep the outpost running into the next decade, NASA said. U.S. astronaut Shane Kimbrough left the station’s airlock at about 6:30 a.m. EST (1130 GMT) to begin his second spacewalk this month. Kimbrough and Pesquet breezed through work on the batteries and co