The longest spacewalk ever by American astronauts took place in 2001 and lasted almost nine hours. Do you know how long the very first U.S. spacewalk lasted? | NASA's Johnson Space Center

The #spacewalk continues! Astronaut Scott Kelly and Astronaut Kjell Lindgren are around halfway through today’s scheduled 6.5 hour spacewalk. Watch the rest of their work live on NASA Television: http://go.nasa.gov/1PT6FGT For more information about spacewalks, visit our Tumblr: http://nasa.tumblr.com/post/132038157669/7-things-to-know-about-spacewalks | NASA - National Aeronautics and Space Administration