NATIONAL  ·   December 21, 2013

Astronauts perform first in series of spacewalks

- NASA astronauts Rick Mastracchio and Mike Hopkins venture out of the International Space Station for the first of a series of urgent repair spacewalks to revive a crippled cooling line. ()

- NASA astronauts Rick Mastracchio and Mike Hopkins venture out of the International Space Station for the first of a series of urgent repair spacewalks to revive a crippled cooling line. ()

Astronauts perform first in series of spacewalks (6:06)

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