http://www.newsweek.com/nasa-spacewalk-livestream-how-watch-raja-chari-matthias-maurer-1690957 > NASA is hosting a livestream showing a spacewalk by two astronauts as they help maintain crucial cooling systems aboard the International Space Station (ISS). > The spacewalk livestream began at 7:30 a.m. ET on Wednesday morning as NASA astronaut Raja Chari and European Space Agency (ESA) astronaut Matthias Maurer were preparing to exit the ISS and step into the vast vacuum of space.