Two astronauts will step out of the International Space
Station today on the first of three spacewalks to stock the orbiting lab with
spare parts.
Veteran spacewalker
Mike Foreman and rookie astronaut Bobby Satcher plan to exit the station at
9:18 a.m. EST (1418 GMT). The two NASA spaceflyers are slated to spend about 6
1/2 hours floating outside to install a spare antenna and complete other
station maintenance tasks.
"To go outside — and it's a great view from inside the
shuttle — but outside with just your helmet and that visor in front of you, and
panoramic view of the Earth and the heavens, it's just amazing," Foreman
said of spacewalking, during a preflight interview.
Foreman and Satcher arrived
at the orbiting laboratory Wednesday along with four other crewmembers flying
aboard the space shuttle Atlantis' STS-129 mission, led by commander Charlie
Hobaugh. The shuttle
launched Monday to begin the 11-day spaceflight.
The spacewalkers' first task will be to unload a spare
communications antenna from the shuttle's cargo bay and install it on the
station. The new element will serve as backup in case the antenna currently in
use breaks and a replacement is needed.
After that, Satcher plans to add some grease to the end of
the station's Japanese robotic arm and an attachment point on the outpost's
railcar. Both devices have grabbing mechanisms called snares that can get stuck
if not properly lubricated. Meanwhile, Foreman will attach a set of cables and
a new handrail to be used during a future mission when a new node is installed
on the station.
"I'll spend most of the spacewalk actually flying on the
robotic arm, so it'll be a pretty incredible view because the arm kind of takes
you away from [the] structure and you're kind of hovering above
everything," Satcher said.
The spacewalk is crucial for the mission's overall goal of outfitting
the station to prepare for the era after the retirement of the space
shuttles and their large cargo-carrying ability. NASA's three-orbiter shuttle
fleet is due to stop flying in about a year.
Atlantis arrived bearing two large platforms full of extra
parts to have on hand in case something breaks. One of them was installed on
the station's main truss late Wednesday.
"Having these already there is going to make things
much easier down the road for long term of the International Space Station to
2015 or beyond," said lead STS-129 flight director Mike Sarafin.
Thursday's spacewalk will mark Satcher's orbital debut, an
experience he's expecting to relish.
"That's going to be the highlight, I think, of the
flight for me," Satcher said in a preflight interview. "Really
stepping out and seeing the vastness of the view of the Earth and the space
station and the shuttle and then, of course out beyond. That is going to be
spectacular... I hear people describe it and they all say that it has a
significant impact on their perspective overall and it's a life-changing
event."
Mission specialist Randy Bresnik, who is expecting his wife
to give birth to a baby girl Friday, will help orchestrate the spacewalk from
inside the station. Shuttle pilot Barry "Butch" Wilmore and mission specialist
Leland Melvin will also assist by controlling the shuttle's robotic arm from inside
the station.
SPACE.com is providing complete coverage of Atlantis'
STS-129 mission to the International Space Station with Staff Writer Clara
Moskowitz and Managing Editor Tariq Malik based in New York. Click here for shuttle mission
updates and a link to NASA TV. Live spacewalk coverage begins at 8:30 a.m. ET.
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