Watch two astronauts take a milestone spacewalk outside the International Space Station right now! – Space.com

NASA astronauts Chris Cassidy and Bob Behnken are about to emerge back in the black.

The spacewalking duo will make a fourth excursion outside the International Space Station (ISS) for Expedition 63 Today (July 21), and you can watch the entire thing live here on Space.com, courtesy of NASA TV, or directly via the agency’s website. The spacewalk began at 7:12 a.m. EDT (1112 GMT).

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