First-time NASA spacewalkers venture outside the space station
Briefly

Sign up for CNN's Wonder Theory science newsletter.Explore the universe with news on fascinating discoveries, scientific advancements and more.Things are about to get busy on the International Space Station as the first in a series of end-of-the-year spacewalks kicked off Tuesday morning.First-time spacewalkers and NASA astronauts Josh Cassada and Frank Rubio began their excursion outside the space station at 9:14 a.m.
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