NASA holds a news conference ahead of a scheduled spacewalk on 30 June, when astronauts will venture outside the International Space Station to replace a wrist joint on the orbital complex’s Canadarm2 robotic arm. Speakers include: NASA Johnson International Space Station Program operations and integration manager Bill Spetch; NASA Johnson spacewalk flight director Fiona Antkowiak; CSA deputy liaison manager Jason Dyer. SUBSCRIBE to our YouTube channel for more videos: http://www.youtube.com/