WASHINGTON, D.C. -- There's big news at the International Space Station Tuesday.
That's because NASA is streaming a six-and-a-half hour spacewalk live online.
Streaming video by Ustream American Flight Engineer Chris Cassidy and European Astronaut Luca Parmitano are on a repair and remodel mission at the space station.
Both astronauts came out of the space station airlocks just after 6:25 a.m. Tuesday.
The duo is currently working on a new module that will serve as a lab, docking port, and airlock for the station.
Both are wearing helmet cams with "ghosted" numbers in the picture. Cassidy is no. 20. Parmitano is no. 17.
You can hear NASA's Mission Control guiding the astronauts through their repair duties, as well as get first-person looks of the repair via the helmet cams.