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foreign

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welcome to space to ground I'm Chelsea

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ballarte last week two astronauts

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completed a spacewalk by going outside

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of the International Space Station and

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of course when an astronaut goes outside

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they can't just open the door so they

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use what's known as an airlock and when

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an experiment needs to go out the space

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station actually has a mini version

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called a payload airlock so come on

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let's go take a tour

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this is the Japanese experiment module

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better known as the gem first let's

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check out the pressurized module it's a

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room inside the International Space

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Station about the size of a tour bus and

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it's a place for astronauts to conduct

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scientific experiments here in the lab

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you'll find racks full of experiments

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all along the walls for crew members to

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work on throughout the day

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at the end of the room is the gem air

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lock through this chamber astronauts can

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move experiments from the inside to the

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outside of the space station and then

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astronauts can use a robotic arm to

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mount these experiments onto a platform

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out into the vacuum of space without

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actually having to go outside themselves

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this platform has been home to a number

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of experiments from different scientific

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Fields over the years some experiments

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have collected data on cosmic rays While

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others have looked at air pollution in

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Earth's atmosphere these experiments can

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be exposed to the space environment for

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years at a time and easily be swapped

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out using the Japanese experiment

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modules airlock

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sometimes researchers don't want their

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experiment to sit outside of the space

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station in some cases they prefer their

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small satellites flying free around the

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Earth

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a satellite could hitch a ride into

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orbit on a rocket launching from Earth

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or an astronaut can install a cubesat

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deployer to be sent out through the gem

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airlock and picked up by Jem's robotic

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arm the arm can then point away from the

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space station and deploy the small

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satellites into a safe orbit around the

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Earth

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researchers have more control because

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they can choose the best time to deploy

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their satellite without having to wait

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for a rocket launch the astronaut can

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also look them over and make sure

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they're not damaged before their release

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most of the small satellites and the

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other experiments inside the gem came to

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the space station aboard a cargo

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spacecraft these Freighters routinely

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deliver supplies to the space station

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and just this week the progress 83 cargo

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ship launched from the baikonur

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cosmodrome in Kazakhstan carrying

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thousands of pounds of supplies

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that's space to ground for this week

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thanks for watching you can keep up with

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the science and more by following at ISS