Live: NASA astronauts conduct a spacewalk to upgrade ISS power system宇航员太空行走修复国际空间站电池动力系统

NASA astronauts Chris Cassidy and Robert Behnken conduct a #spacewalk to finish upgrade work on the #InternationalSpaceStation (ISS). The spacewalk is expected to be the last effort to conclude more than three years of upgrade of the station’s power system.

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