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this is mission control houston the last

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week of the international space

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station's expedition 33 has been

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focusing on getting three of the crew

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members ready to return to earth after

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more than four months on orbit since

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their launch in mid-july station

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commander suni williams flight engineers

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at yuri malenchenko and aki hoshide be

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coming home sunday evening u.s time

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each day this past week each of the

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three of them has had several blocks of

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time on their schedule set aside for

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departure preparation that involves

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packing up their personal gear closing

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out some experiment operations

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packing those returning items into the

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soyuz as well as testing the soyuz

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systems itself

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they've also ramped up their daily

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exercise so they'll be in good shape to

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encounter gravity for malenchenko some

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of that exercise was done wearing the

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lower body negative pressure suit that's

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a russian protocol that uses a suit and

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air pressure to simulate gravity by

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pulling on his lower extremities

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hoshide had his last session with the

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integrated cardiovascular experiment

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which tries to quantify cardiac atrophy

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of the crew members during a long

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duration spaceflight

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he also did exercise for the sprint

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investigation which is looking to find

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out if

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high intensity exercise done in shorter

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spurts is better for fighting bone and

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muscle loss than long sessions of just

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moderate exercise

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on monday and again on friday williams

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malenchiko and hoshide suited up in

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their launch and entry suits and

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conducted soyuz descent drills as they

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get prepared to come home

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station maintenance continued all during

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the week even for the departing crew

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members williams and hoshide set up

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hardware for an upgrade to the wireless

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access points for the station's onboard

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computer network

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flight engineer kevin ford was also busy

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in maintenance this week changing out a

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valve in a water recovery system

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installing radiation area monitors

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throughout the station and installing a

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sensor kit for taking measurements of

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ultrasonic background noise that's for

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an investigation that seeks to develop

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technology that will be able to listen

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for a pressure leak on board the station

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to do that successfully the system would

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need to know what a non-leak noise

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sounds like and that's the goal of the

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sensor kit that ford was installing

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leaving the station didn't reduce the

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commitment of the crew members to

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sharing their experience of space life

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on wednesday hoshide answered questions

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about the flight posed by college

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students who were gathered at the scuba

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space center and on thursday

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williams and ford talked with elementary

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and secondary school students at the

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national air and space museum as part of

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national education week activities

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the crew continued its work while ground

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teams were planning a friday morning

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firing of engines on the 49 progress in

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a debris avoidance maneuver to nudge the

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station away from a possible conjunction

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with an unidentified piece of space junk

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what would be the second debris

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avoidance maneuver in a little more than

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two weeks time would not have any effect

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on the plans for the weekend's soyuz

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undocking and landing

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a ceremony marking the change from

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expedition 33 to expedition 34 is

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scheduled for saturday at 1 15 pm

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houston time expedition 34 officially

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begins and kevin ford becomes space

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station commander when sonny williams

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departs the station and that should take

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place at 4 26 p.m on sunday afternoon

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nasa tv will provide live coverage of

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the change of command ceremony the final

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farewell and hatch closure and the

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departure of williams malenchenko and

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hoshide from the station on sunday

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afternoon as well as their landing in

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northern kazakhstan sunday evening u.s