NASA astronauts completed a 7-hour spacewalk to prepare the ISS for new roll-out solar arrays. The upgrades aim to boost power capacity, counter ageing systems, and support the station’s operations as it approaches its eventual retirement.​NASA astronauts completed a 7-hour spacewalk to prepare the ISS for new roll-out solar arrays. The upgrades aim to boost power capacity, counter ageing systems, and support the station’s operations as it approaches its eventual retirement.  ​ science