https://phys.org/ en-us Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine. Two US astronauts successfully completed Tuesday what NASA described as a "critical" spacewalk to repair a failed piece of equipment that helps power the International Space Station. https://phys.org/news/2017-05-spacewalking-astronauts-tackle-urgent-station.html Space Exploration Tue, 23 May 2017 07:35:11 EDT news414743707