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Welcome to "Space to Ground."

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Your weekly look at what's happening on board
the International Space Station.

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I'm Amiko Kauderer.

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With the first spacewalk of Expedition 41
less than a week away,

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Flight engineers Barry Wilmore, Reid Wiseman,
and Alexander Gerst readied equipment, tools

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and, of course, their spacesuits in preparation
for the two U.S. extravehicular activities

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scheduled this month.

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Wiseman and Gerst are set to venture outside
the orbiting complex on Tuesday October 7

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at 8:10 am eastern for a six-and-a-half hour
excursion to transfer a failed pump module

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to its external stowage platform and to install
an assembly that provides reliable power to

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the system that moves the station's robotic
arm between worksites.

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Wiseman and Wilmore will conduct a second
spacewalk later this month on October 15.

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And this week the station was outfitted with
a new science instrument that will help keep

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an eye on the weather.

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The station's robotic arm was used to remove
the ISS rapid scatterometer, or RapidScat,

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from the external trunk of SpaceX's dragon
cargo ship on Tuesday.

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The hardware was attached to the outside of
the Columbus module and will use the station's

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unique vantage point to better forecast weather
and monitor severe storms.

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And this week's social media question asks
us how RapidScat actually works.

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Well, as the station's first ever rotating
radar, RapidScat will use pulses reflected

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from the ocean's surface from different angles
to calculate surface wind speed and direction

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- gathering more complex data for a more accurate
survey of earth's atmosphere.

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Keep your questions and comments coming using
the hashtag space-to-ground, and make sure

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to follow the ISS on twitter @space_station.

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and for a little bit of fun before we go...we've
always heard that everyone puts their pants

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on one leg at a time, right?...well, astronaut
Reid Wiseman proves that's not always the