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houston station on space to ground

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welcome to space to ground your weekly

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look at what's happening on board the

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international space station i'm dan

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hewitt the first spacewalk of the year

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is in the books and ended a bit

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unexpectedly

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nasa's tim copra and esa's tim peake

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worked together to swap out a voltage

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regulator that failed last year with a

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spare restoring one of the station's

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eight power channels

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shortly after that however the call came

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to end the spacewalk early when a small

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water bubble appeared in copper's helmet

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the crew was never in any danger and

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they made their way safely back inside

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scott kelly and mikhail kornienko got

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suited up in a different way as they

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continued one of the key research

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studies for the one year mission for the

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third time the duo strapped into the

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russian chibis suit for the fluid shifts

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experiment

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scientists are still trying to pinpoint

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why some space fliers have vision

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problems while in microgravity something

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they suspect could come from increased

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fluid pressure in the head

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kelly and kornienko took ultrasounds of

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their eyes while wearing chivas which

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draws fluid back down to the legs as

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well as doing a battery of eye exams

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results from this study could shed light

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on why some astronauts experience vision

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problems as well as give scientists

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ideas for countering the effects

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this week's twitter question comes from

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andrew who wants to know if during a

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spacewalk the suit balloons out more

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than it does during underwater training

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well as it turns out the opposite is

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true

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both suits are pressurized so the

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difference between the inside and

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outside of the suit is 4.3 psi

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the suits in the pool actually balloon

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out a bit more though since they've been

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used so many times and are more worn out

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but astronauts don't really notice this

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the biggest difference astronauts

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experience between the two environments

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is starting and stopping it's much

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easier to start motion in space with no

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resistance but harder to stop with

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nothing to slow you down

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keep sending us your questions using the