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"HOUSTON, STATION
ON SPACE TO GROUND."

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WELCOME TO SPACE TO
GROUND, I AM KAYLA LAFRANCE.

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THIS WEEK ASTRONAUTS ONBOARD
THE STATION WERE BUSY PREPARING

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TO STEP OUTSIDE THE SPACE
STATION FOR ANOTHER SPACEWALK.

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LAST FRIDAY, NASA
ASTRONAUTS NICK HAGUE

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AND ANNE MCCLAIN CONDUCTED
THE FIRST SPACEWALK

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IN THIS SERIES OF THREE.

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THE PAIR VENTURED OUTSIDE
THE STATION'S QUEST AIRLOCK

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TO CONDUCT A SIX AND
A HALF HOUR SPACEWALK

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TO SUPPORT THE REPLACEMENT OF
OLD NICKEL-HYDROGEN BATTERIES

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WITH NEWER, MORE POWERFUL
LITHIUM-ION BATTERIES

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FOR ONE PAIR OF THE
STATION'S SOLAR ARRAYS.

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THE NEW BATTERIES HAD BEEN
TRANSPORTED TO THE STATION

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IN SEPTEMBER ABOARD THE
JAPANESE H-II TRANSFER VEHICLE.

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THIS WEEK NASA ASTRONAUTS
NICK HAGUE

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AND CHRISTINA KOCH
CONTINUED THE EXTERNAL WORK

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ON THE STATIONS POWER SYSTEM

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WHEN THEY CONDUCTED
THE SECOND SPACEWALK.

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THE DUO REMOVED ANOTHER SET
OF NICKEL-HYDROGEN BATTERIES

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AND REPLACED THEM WITH
LITHIUM-ION BATTERIES

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THAT WILL STORE ENERGY
FOR ANOTHER

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OF THE STATION'S
EIGHT POWER CHANNELS.

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THIS SPACEWALK COMPLETED
THE SECOND ROUND OF UPGRADES

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TO THE STATION'S POWER
SYSTEM THAT BEGAN

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WITH SIMILAR BATTERY REPLACEMENT
SPACEWALKS IN JANUARY 2017.

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THE 3RD EVA IN THE SERIES
WILL BE CONDUCTED ON APRIL 8TH

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BY NASA ASTRONAUT ANN MCCLAIN

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AND CANADIAN ASTRONAUT
DAVID SAINT-JACQUES.

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DURING THIS EVA, THE TWO SPACE
WALKERS WILL DEPLOY JUMPER

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CABLES BETWEEN THE UNITY
MODULE AND THE S0 TRUSS,

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AT THE MIDPOINT OF THE
STATION'S BACKBONE.

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TUNE INTO NASA TV ON APRIL
8TH STARTING AT 6:30 AM EASTERN

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FOR LIVE COVERAGE
OF THIS FINAL EVA.

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THIS WEEK'S QUESTION COMES
FROM STEPHEN WHO ASKED,

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HOW MANY EXPERIMENTS TO
DATE HAVE BEEN CONDUCTED

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ON THE SPACE_STATION?

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SINCE THE ISS LAUNCHED
OVER 20 YEARS AGO,

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MORE THAN 2500 RESEARCH
INVESTIGATIONS FROM RESEARCHERS

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IN 106 COUNTRIES
HAVE BEEN CONDUCTED

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ON THE ORBITING LABORATORY.

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THESE EXPERIMENTS CROSS
MANY DIFFERENT FIELDS,

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INCLUDING ASTRONOMY, BIOLOGY,
EARTH SCIENCE, PHYSICAL SCIENCE,

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TECHNOLOGY DEVELOPMENT

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AND DEMONSTRATION,
AND HUMAN RESEARCH.