Live coverage: Atlas 5 countdown and launch journal

Two NASA astronauts will take part in the first all-female spacewalk this week, a critical outing to restore lost power in the wake of an equipment failure that cropped up after new batteries were installed in the International Space Station’s solar power system during two earlier spacewalks.

United Launch Alliance (ULA) is set to roll its Atlas 5 rocket and the Starliner spacecraft back to the Vertical Integration Facility on Wednesday to begin working on the problematic valve. The new launch date is no earlier than Friday, May 17, at 6:16 p.m. EDT (2016 UTC).

Follow the Delta 4 rocket’s ascent into orbit from Cape Canaveral’s Complex 37 launch pad with the U.S. Air Force’s WGS 8 communications satellite. Liftoff is scheduled for Wednesday at 6:53 p.m. EST.