In this image taken from NASA astronaut Jessica Meir works to finish upgrading the International Space Station's power grid, Wednesday, Jan. 15, 2020. NASA is in the midst of replacing decades-old nickel-hydrogen batteries outside the sprawling space station with more powerful, longer-lasting lithium-ion batteries. The batteries are part of the station's solar power network, keeping everything running when the outpost is on the night side of Earth. It was the second pairing of Meir and Christina Koch outside the orbiting lab. (NASA via AP)