Must be able to work in a fast-paced environment – 17,500 miles per hour, that is.⁣ ⁣ Astronaut Josh Cassada, pictured here, prepares a roll-out solar array so it can unfurl on the International Space Station (iss) as the orbiting lab flew 262 miles (421 kilometers) off the coast of Namibia.⁣ ⁣ NASAAstronauts Frank Rubio and Josh Cassada conducted a spacewalk on Thursday, Dec. 22, for seven hours and eight minutes to install the new roll-out solar arrays to upgrade the station’s power system. The new iROSA solar arrays will increase power generation capability by up to 30%, increasing the station’s total available power from 160 kilowatts to up to 215 kilowatts.⁣ ⁣ Apart from the challenges of working in microgravity, handling 70-100 tools and tethers, spacewalking astronauts also face a wide variety of temperatures. Astronauts experience a wide range of temperatures during a spacewalk. In low-Earth orbit, spacesuits can get to minus 250 degrees Fahrenheit. In the sunlight, they can ...