Astronauts leave space station for third spacewalk

Two US astronauts left the International Space Station on Sunday for a seven-hour spacewalk to install communications and navigation aides for new commercial space taxis.

Station commander Barry "Butch" Wilmore and flight engineer Terry Virts floated outside the station's Quest airlock shortly after 7 a.m. EST/1200 GMT to begin their third spacewalk in eight days, a NASA Television broadcast showed.

The purpose of the outings is to prepare berthing slips for spaceships being developed by Boeing and Space Exploration Technologies, or SpaceX.

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