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houston station on space to ground

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around and around and around it goes

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welcome to space to ground i'm dan

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hewitt the station passed another

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milestone this week with its 100 000th

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orbit

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in the 17 years since the first module

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zarya launched back in november 1998 the

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station has traveled the distance of

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over 2.6 billion miles which is almost

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the distance between the earth and

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neptune

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for another idea of the distance that's

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the equivalent of about 10 round trips

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to mars

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in that time more than 1900 experiments

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have taken place and 222 people have

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either lived there or visited

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a whole fleet of satellites shot away

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from the station this week to study the

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earth below

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17 cubesats were deployed from outside

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of the japanese kibo module for a range

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of missions among them were two from

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colleges studying earth's atmosphere and

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even the first cubesat built by

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elementary school students courtesy of

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st thomas moore cathedral school

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also deployed where nasa's node

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satellites studying space communication

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networks more planet labs dove

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satellites to image the earth and four

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lemur satellites that will track ships

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on the ocean and provide weather data

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this week hoboken catholic academy's 7th

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grade class wants to know how the

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airlock works to get in and out of the

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iss for spacewalks well class it's as

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simple as pulling air out or putting it

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back in

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when astronauts are ready to go outside

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a series of pumps suck out the air

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inside of the airlock and store it in a

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set of tanks this makes the inside of

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the air lock close to being a vacuum

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where there is no air pressure just like

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space so it's possible to open the outer

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hatch safely

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once the crew comes back in and the

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hatch is resealed the air gets pushed

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back in from those tanks bringing the

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airlock back to the same pressure as the

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rest of the station keep sending us your