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"HOUSTON, STATION
ON SPACE TO GROUND"

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THAT VIEW SPEAKS FOR ITSELF.

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WELCOME TO SPACE TO
GROUND, I'M DAN HUOT.

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ANOTHER WEEK, ANOTHER SPACEWALK
FOR THE CREW OF EXPEDITION 50.

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THIS WEEK SAW NASA
ASTRONAUTS SHANE KIMBROUGH

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AND PEGGY WHITSON WORKING
TOGETHER FOR SEVERAL HOURS

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IN THE VACUUM OF SPACE.

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THEY SUCCESSFULLY SWAPPED IN
AN UPGRADED COMPUTER RELAY BOX

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WHICH GIVES MISSION CONTROL
ACCESS AND DATA FROM A BUNCH

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OF SYSTEMS ON THE
OUTSIDE PART OF STATION.

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THEY REMOVED A COVER
AND PLUGGED IN CABLES

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ON PRESSURIZED MATING
ADAPTER-3, WHICH WAS JUST MOVED

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OVER THE WEEKEND AND WILL
BE A FUTURE DOCKING PORT

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FOR COMMERCIAL CREW SPACECRAFT.

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AND THEY INSTALLED SHIELDING FOR
THE NOW EMPTY PORT ON NODE 3,

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AND SOME SHIELDING ON PMA-3.

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AND WITH THIS BEING
WHITSON'S EIGHTH SPACEWALK,

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SHE NOW HOLDS THE RECORD
FOR MOST SPACEWALKS

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BY A FEMALE ASTRONAUT.

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EVEN WITH ANOTHER SPACEWALK,
THE CREW FOUND THE TIME

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FOR SOME ADVANCED SPACE SCIENCE.

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PEGGY WHITSON SET UP HARDWARE
FOR THE ACE-T-1 EXPERIMENT,

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WHICH IS INVESTIGATING COLLOIDS,
OR TINY SUSPENDED PARTICLES.

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THE PARTICULAR PARTICLES USED
IN THIS EXPERIMENT ARE REFERRED

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TO AS JANUS PARTICLES,

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NAMED AFTER THE TWO
FACED ROMAN GOD JANUS

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BECAUSE THESE PARTICLES
POSSESS TWO DISTINCT TYPES

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OF PROPERTIES: ONE HALF
OF THEIR SURFACE INTRACTS

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WITH WATER WHILE THE
OTHER HALF REPELS IT.

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STUDYING THESE IN SPACE HELPS
SCIENTISTS UNDERSTAND THEIR

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FUNDAMENTAL BEHAVIOR WHICH
COULD LEAD TO A METHOD

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OF CREATING SELF-ASSEMBLING
OR SELF-REPLICATING MATERIALS!

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OUR TWITTER QUESTION THIS WEEK
COMES FROM AUSTIN WHO WANTS

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TO KNOW IF THE ASTRONAUT'S
EARS POP ON SPACEWALKS

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BECAUSE OF THE LOWER
PRESSURE IN THE SUIT.

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EXCELLENT QUESTION AUSTIN.

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THE ANSWER IS YES FOR
SOME, BUT WE DO A LOT

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TO MAKE SURE THE PRESSURE
CHANGES AREN'T TOO HARD

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ON THE CREW.

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THE PRESSURE ON STATION IS
ABOUT 14.7 PSI, THE EXACT SAME

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AS AT SEA LEVEL HERE ON EARTH.

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IN A SUIT IT'S ONLY 4.3,
WHICH MAKES IT EASIER

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FOR THE ASTRONAUTS TO
MOVE AROUND WHILE WORKING

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IN THE VACUUM OF SPACE.

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THEY DO LIGHT EXERCISE
AFTER GETTING SUITED

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UP TO REMOVE EXTRA
NITROGEN FROM THEIR BLOOD,

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WHICH HELPS THEM AVOID
DECOMPRESSION SICKNESS,

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OR THE BENDS AS ANY SCUBA
DIVERS MIGHT CALL IT.

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AT THE END OF THE SPACEWALK,

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THEY GRADUALLY RAISE THE
PRESSURE INSIDE THE AIRLOCK

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TO AVOID THINGS LIKE POPPING
EARS BUT IT CAN HAPPEN.

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KEEP SENDING YOUR
QUESTIONS USING THE HASHTAG