INTERNATIONAL SPACE STATION -- Astronauts began the first of three spacewalks to bring upgrades to the International Space Station Friday morning.
NASA astronauts Anne McClain and Nick Hague are working to replace old nickel-hydrogen batteries with new lithium-ion batteries. They are first-time spacewalkers.
Throughout the excursion, they will stay in contact with NASA's master control in Houston, Texas.
Then, next week McClain and Christina Koch will make history when they participate in the first all-female spacewalk.
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