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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 scott kelly spent this week

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preparing the station for a supercharged

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boost to its air supply

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two tanks for the nitrogen oxygen

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recharge system or noise are getting

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ready to fly in the next cygnus resupply

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mission to the station weighing in at

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about 240 pounds these tanks are

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pressurized to over 6 000 psi more than

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double what you might find in scuba

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diving tanks they'll provide additional

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breathing gases for the station

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atmosphere and the pure oxygen

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astronauts breathe right before suiting

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up for a spacewalk and now we go from

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air tanks to rocket tanks this week in

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station science sphere sloshes back and

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it's helping engineers get an inside

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look at how liquid fuel moves around in

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space

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two of the bowling ball shaped

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satellites flew around the station

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strapped to a fuel tank as part of an

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investigation to improve our

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understanding of how rocket propellant

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behaves while in microgravity vital for

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improving the safety and efficiency of

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future spacecraft

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this week's question is from iceblade

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who is wondering why white specs show up

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in some of the videos from station well

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as it turns out humans aren't the only

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things that have to battle the negative

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effects of being in space

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harmful radiation is a big concern while

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exploring the cosmos and it can actually

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damage electronics the space station is

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close enough to earth to be well

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protected but things like camera sensors

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can take radiation hits this is why

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you'll sometimes see dead pixels and

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videos from the station and why we fly

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experiments like the high definition

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earth viewing payload to see how long

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cameras can last keep sending us your