A fifth and final spacewalk to service the Hubble Space Telescope is under way today as the crew of shuttle Atlantis looks to close out what to date has been a wildly successful mission.Running almost an hour ahead of schedule, Atlantis mission specialists John Grunsfeld and Drew Feustel switched their spacesuits to battery power at 8:20 a.m., marking an official start of the spacewalk.
Grunsfeld is wearling a spacesuit with red stripes on its pant legs, and he is answering to the call sign "EV_1." Feustel is "EV-2" and is wearing an all-white spacesuit.
Feustel was the first out of the airlock. Grunsfeld will be mounting the end of the shuttle's robot arm.
The first order of business: Swapping out three of six original nickel-hydrogen batteries that have been powering Hubble since its April 1990 launch.
The other three were swapped out last Friday on the second spacewalk.
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