Photos: Atlas 5 rocket aims for International Space Station

Two months after a first test-firing ended prematurely, NASA plans to ignite the core stage of the first Space Launch System heavy-lift rocket again Thursday for an eight-minute burn to confirm it is ready for shipment to the Kennedy Space Center for launch preparations.

Two spacewalking astronauts working outside the International Space Station Friday completed work to replace aging batteries in one of the lab’s eight main solar power circuits. A second spacewalk next week, along with additional work with the station’s robot arm, will upgrade a second power channel.

A three-stage Soyuz booster rocket, capped by a three-person crew transport capsule, rolled out to a launch pad in Kazakhstan on Monday, two days before blasting off with new residents headed for the International Space Station.