RT @NASA: LIVE NOW: Two US astronauts perform #spacewalk to install new @Space_Station docking port: go.nasa.gov/2bGUP6g https://t.co/use6yTVrTg
RT @NASA: LIVE NOW: Two US astronauts perform #spacewalk to install new @Space_Station docking port: go.nasa.gov/2bGUP6g https://t.co/use6yTVrTg