The International Space Station's Cold Atom Laboratory for fundamental physics experiments got a hardware upgrade. How astronauts Christina Koch and Jessica Meir successfully completed the challenging installation, removing and replacing the lab's Science Module: https://go.nasa.gov/3fKO6Gb More: https://coldatomlab.jpl.nasa.gov | NASA - National Aeronautics and Space Administration

How NASA trains astronauts for work in space Making a spacewalk is a dream for many. But in a zero-gravity environment, things are unpredictable. CCTV's Sean Callebs finds out how American astronauts train at NASA. | CGTN