NASA astronauts Jessica Meir and Christina Koch are set to conduct the first spacewalk to be performed by two women on Friday, Oct. 18, 2019.

They will be replacing a faulty battery charge/discharge unit that failed to activate after a spacewalk Oct. 11. The faulty unit is preventing a set of recently installed batteries from providing increased power. It must be replaced before continuing a series of spacewalks to install new batteries.

Watch live coverage here on NASA TV and nasa.gov/live Friday beginning at 6:30 a.m. Eastern. The spacewalk is scheduled to begin at about 7:50 a.m.