Two NASA astronauts will conduct a long-delayed spacewalk today (March 18), and you can watch the action live. NASA astronauts Jessica Meir and Chris Williams will venture outside the International Space Station (ISS) today at around 8 a.m. EDT (1200 GMT), kicking off a spacewalk expected to last about 6.5 hours. You can watch it live here at Space.com, courtesy of NASA, or directly via the space agency . Coverage will start at 6:30 a.m. EDT (1030 GMT). NASA astronaut and Expedition 72 Flight Engineer Anne McClain is pictured near one of the International Space Station’s main solar arrays during a spacewalk on May 1, 2025 to upgrade the orbital outpost’s power generation system and relocate a communications antenna. (Image credit: NASA) Today's spacewalk was originally scheduled for Jan. 8, with NASA's Mike Fincke and Zena Cardman supposed to suit up. But that plan was nixed when a then-unnamed member of SpaceX 's Crew-11 astronaut mission to the ISS experienced a medical issue .…