Washington: Two astronauts from the Discovery space shuttle Saturday began a second spacewalk to perform maintenance work on the International Space Station, US space agency NASA reported.
US astronauts Steve Swanson and Joseph Acaba will swap out batteries, fasten an antenna and install equipment for external storage, according to NASA.
The spacewalk is expected to last six and a half hours.
On Friday, the Discovery crew completed installation of the station's final pair of solar panels, which will expand the satellite's power supply.
Discovery is scheduled to end its 13-day mission March 28. One more spacewalk is scheduled for Monday.
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