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it is tuesday april 23rd and science has

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been at the top of the agenda today for

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the expedition 35 crew on board the

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international space station commander

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chris hadfield started his day with a

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blood draw for the experiment called

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vascular that is a canadian

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investigation that's looking into the

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long-term effect of zero gravity on the

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blood vessels

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hadfield was been tested before flight

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now being tested during flight and will

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be tested after the flight as well

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the current samples being stowed in the

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minus 80 degrees laboratory freezer

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that's in the kibo module for later

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return to earth and the study by the

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vascular investigators hadfield then

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moved on to work in the columbus

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laboratory module this morning he

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rotated the express rack 3 out of the

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aft wall of columbus and went to work to

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replace a water valve in the cooling

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system that was a lengthy task that took

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him took up all of his morning and

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pushed both of his daily exercise

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sessions as in off into his afternoon

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for his uh crewmates pavel vinogradov

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and roman romanenko they started their

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day with a drill at the toru system they

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practice the potential use of a remote

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control docking system to bring a

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progress ship in to dock at the zvezda

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modules aft docking port just in case

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the automated docking system doesn't

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work properly the next progress vehicle

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is scheduled to launch from the baikonur

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cosmodrome in kazakhstan at 5 12 houston

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time on wednesday morning and dock to

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the station on friday morning you'll

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have live coverage of the launch and of

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the docking on nasa television and

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nasa.gov

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both vinogradov and romanenko had most

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of the rest of the day off duty than to

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make up for their

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working this past weekend to clean up

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from last friday's spacewalk

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flight engineer chris cassidy

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concentrated his work at the multi

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microgravity sciences glovebox

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he was setting up for and then has been

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executing test burns for the experiment

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bass that's burning and suppression of

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solids

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bass is examining the characteristics of

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ignition and extinction of a range of

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different fuel samples the intent there

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is to contribute to the computational

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models for brand new fire detection and

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suppression systems

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and therefore to guide the development

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of strategies for putting out accidental

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fires in a spacecraft

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flight engineer tom marshburn spent most

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of tuesday working at the capillary flow

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experiment that's actually a suite of

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experiments that are investigating the

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flow of fluids in the microgravity

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environment especially inside containers

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that have unusual or complex geometries

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the results those experiments will be

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providing data to the people who are

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designing programs that model fluid flow

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those models are going to be used by the

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designers of low gravity fluid transfer

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systems we're going to try to improve

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the fluid flow on board spacecraft of

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the future

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flight engineer alexander misurkin

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started tuesday with some computer

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software maintenance work and has spent

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most of the rest of the day with pump

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panel maintenance in the rasvieth module

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as well as russian systems maintenance

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inside zvezda

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all six crew members also had the daily

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exercise sessions that are designed to

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maintain their overall physical fitness

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as well as combat the loss of bone and

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muscle mass that occurs to people who

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spend extended periods of time in space

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in an environment where there is not

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even gravity for their bones or muscles

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to work against

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that's going to become

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important for all of the crew members

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especially more important now for chris

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hadfield roman romanenko and tom

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marshburn as they prepare to return to

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earth in a few weeks their mission

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onboard the international space station