Blogger Update, 2:29 p.m.: Endeavour commander Mark Polansky and three crewmates took time out to answer questions submitted to the skipper's Twitter account: Astro_127. They ranged from "What is the best thing to do in space" to "What is it like to look down on Earth to my favorite: "How do you sneeze if you are spacewalking in a spacewalk. The answer from Endeavour lead astronaut Dave Wolf: "Aim low." You don't want to mess up your windshield.
The Endeavour astronauts are about to take a half-day off after completing a series of complex crane operations that set the stage for the third of five spacewalks planned during the shuttle's stay at the International Space Station.
Coming up at 2:13 p.m.: Mission commander Mark Polansky will answer questions submitted via his twitter account -- Astro_127. The answers will be put up on YouTube.
The astronauts are wrapping up their robot arm work for the day. The station's 57-foot arm now is latched to a shuttle-launched equipment carrier, which is atop the outpost's Mobile Transporter rail cart.
The rail cart is about to be moved to the work site closest to the port end of the station's central truss.
Endeavour mission specialists Dave Wolf and Chris Cassidy will head out to that area during a spacewalk Wednesday to remove and replace batteries that have been powering station systems on the dark side of Earth since December 2000.
The new nickel-hydrogen batteries are latched onto the Integrated Cargo Carrier, which was launched inside Endeavour's expansive payload bay.
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