by 
ASA spacewalkers (from left) Bob Behnken and Chris Cassidy give a thumbs up during a spacewalk to install hardware and upgrade International Space Station systems.
Source:: updates 3
Thumbs Up From Out of This World
Let's Dance with Aliens
ASA spacewalkers (from left) Bob Behnken and Chris Cassidy give a thumbs up during a spacewalk to install hardware and upgrade International Space Station systems.
Source:: updates 3
