The spacewalk is under way at the International Space Station.
Discovery astronauts Scott Parazynski and Douglas Wheelock switched their spacesuits to battery power at 6:02 a.m., marking the start of the planned 6.5-hour excursion.
Shuttle Discovery and the station were flying 220 miles above the west coast of South America at the time.
"You guys can go out and play," station commander Peggy Whitson told the astronauts before they embarked.
"We call it work, but you know better," Parazynski replied. "Best job in the universe."
Parazynski was first out of the hatch. Wheelock followed. Their first order of business will be retrieving a broken radio communications antenna -- the S-Band Antenna Structural Assembly -- or SASA -- so it can be returned to Earth.
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