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"HOUSTON, STATION
ON SPACE TO GROUND."

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WELCOME TO SPACE TO
GROUND, I'M ISIDRO REYNA.

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THIS WEEK ON STATION,
THE CREW PREPARED

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FOR AN UPCOMING SPACEWALK.

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TWO NASA ASTRONAUTS
ARE SCHEDULED

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TO VENTURE OUTSIDE THE
INTERNATIONAL SPACE STATION

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FOR A SIX-AND-A-HALF-HOUR
SPACEWALK ON MAY 16TH.

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EXPEDITION 55 FLIGHT
ENGINEERS DREW FEUSTEL

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AND RICKY ARNOLD HAVE BEEN
PREPPING THEIR SPACESUITS

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AND REVIEWING PROCEDURES
THIS WEEK

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FOR WHAT WILL BE THE
210TH SPACEWALK IN SUPPORT

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OF STATION ASSEMBLY,
MAINTENANCE AND UPGRADES.

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THE PRIMARY OBJECTIVE IS

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TO FINISH UPGRADING
COOLING SYSTEM HARDWARE.

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LIVE COVERAGE OF THE
SPACEWALKS WILL AIR

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ON NASA TV AND NASA.GOV.

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THIS WEEK, THE CREW WORKED

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ON THE ELECTRO-STATIC LEVITATION
FURNANCE ALSO KNOWN AS ELF.

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ELF IS AN EXPERIMENTAL
FACILITY DESIGNED TO LEVITATE,

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MELT AND SOLIDIFY MATERIALS

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BY CONTAINERLESS PROCESSING
TECHNIQUES USING THE

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ELECTROSTATIC LEVITATION METHOD.

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WITH THIS FACILITY,
THERMOPHYSICAL PROPERTIES

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OF HIGH TEMPERATURE MELTS CAN
BE MEASURED AND SOLIDIFICATION

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FROM DEEPLY UNDERCOOLED
MELTS CAN BE ACHIEVED.

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THE CREW EXCHANGED
THE SAMPLE HOLDERS

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AND INSTALLED A NEW SAMPLE
CARTRIDGE WITHIN ELF TO PREPARE

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FOR UPCOMING GROUND-COMMANDED
OPERATIONS.

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STUDENTS FROM HOUSTON AREA
SCHOOLS SPOKE TO ASTRONAUTS

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ON THE STATION DURING AN
EVENT HOSTED BY BOEING

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AND SPACE CENTER HOUSTON.

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THE EVENT WAS PART OF NASA'S
YEAR OF EDUCATION ON STATION.

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SCOTT TINGLE WAS ASKED ABOUT THE
SCIENCE BEING CONDUCTED ONBOARD

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THE ISS.

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"WE HAVE IN ANY GIVEN TIME
200 TO 250 EXPERIMENTS

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THAT ARE BEING WORKED ON THE
INTERNATIONAL SPACE STATION,

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BUT SOME OF THE BIG ONES
THAT I'VE BEEN WORKING

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ON INCLUDES APEX AND VEGGIE AND
THEY INCLUDE GROWING VEGETABLES.

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WE GROW LETTUCE, WE'RE LOOKING
AT COMBUSTION, WE'RE LOOKING

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AT CAPILLARY FLUIDS FLOW, AND
WE'RE TAKING PART IN A LOT

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OF HUMAN REASEARCH SUCH AS
WHAT HAPPENS WITH OUR BLOOD,

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WHAT HAPPENS WITH HEADACHES AND
FLUID SHIFT, AND WHAT HAPPENS

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WITH OUR BONE DENSITY,
AND THINGS LIKE THAT.

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SO LOTS OF STUFF GOING ON HERE

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AND IT'S AN AMAZING
PLACE TO BE."

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THIS WEEK'S TWITTER
QUESTION COMES FROM OZZY.

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HE WANTS TO KNOW HOW
ASTRONAUTS KEEP TRACK

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OF WHERE THEY ARE IN SPACE.

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THE STATION'S POSITION OR
STATE IN SPACE IS DETERMINED

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BY A GLOBAL POSITIONING SYSTEM
OR GPS RECEIVER SIMILAR TO THOSE

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IN A CAR OR MOBILE PHONE.

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THE RECEIVER KEEPS TRACK OF
THE SPACE STATION'S POSITION

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AND VELOCITY AT ALL
POINTS IN ORBIT.

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FLIGHT CONTROLLERS
IN HOUSTON KEEP TRACK

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OF HOW THE STATION IS ORIENTED
AND WHERE THE SUN, EARTH,

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AND COMMUNICATION SATELLITES
ARE IN REFERENCE TO STATION.