NASA spacewalk begins outside space station - See helmet cam views and more

U.S. Spacewalk 83 is underway with astronauts Josh Cassada and Frank Rubio installing an ISS Roll Out Solar Array (iROSA) on the "4A power channel on the port truss," according to NASA. Watch live: https://www.space.com/nasa-astronauts-spacewalk-december-21-webcast Credit: NASA