Spacewalk to Upgrade Space Stations Power System

On July 21, NASA astronauts Chris Cassidy and Robert Behnken will conduct a spacewalk to perform a number of tasks designed to upgrade station systems. Coverage will begin around 7:15 a. m. EDT, and may last up to seven hours. This will be both astronauts 10th spacewalk outside the orbital lab and Behnken s final before returning to Earth on SpaceX s Dragon Endeavor on August 2.