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"HOUSTON, STATION ON SPACE TO GROUND."

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WELCOME TO SPACE TO GROUND, I’M KATHRYN
CLAYTON.

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THIS WEEK, THE EXPEDITION 64 SAYS FAREWELL,

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THERE'S PREPARATIONS FOR THE SPACEX CREW 2
LAUNCH,

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AND SCIENCE JUST RIGHT FOR EARTH DAY.

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AFTER THE ARRIVAL OF NASA ASTRONAUT MARK VANDE
HEI

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AND ROSCOSMOS COSMONAUTS OLEG NOVITSKIY AND
PYOTR DUBROV LAST WEEK,

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THE EXPEDITION 64 CREW CAN NOW RETURN HOME.

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NASA ASTRONAUT KATE RUBINS ALONG WITH

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SERGEY KUD SVERCHKOV AND SERGEY RYZHIKOV OF
ROSCOSMOS

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WILL UNDOCK FROM THE STATION THIS WEEK,

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MARKING THE END OF EXPEDITION 64.

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DURING THIS TRANSITION ISS COMMAND

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WILL CHANGE FROM SERGEY RYZHIKOV

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TO NASA ASTRONAUT SHANNON WALKER.

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SHANNON WILL REMAIN IN COMMAND UNTIL

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THE END OF APRIL WHEN SHE WILL JOIN

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ASTRONAUTS MIKE HOPKINS AND VICTOR GLOVER

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ALONG WITH JAXA ASTRONAUT SOICHI NOGUCHI TO
RETURN TO EARTH.

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THE UPCOMING CREW-2 LAUNCH WILL BRING

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FOUR NEW CREWMEMBERS TO THE INTERNATIONAL
SPACE STATION.

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THE SPACEX CREW-2 MISSION IS READY TO TRAVEL
TO THE ISS

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AND WILL BE LAUNCHING ON APRIL 22nd.

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THE FLIGHT WILL MARK THE SECOND FLIGHT

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OF THE CREW DRAGON ENDEAVOUR TO THE STATION,

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AND WILL CARRY NASA ASTRONAUTS SHANE KIMBROUGH
AND MEGAN MCARTHUR,

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JAXA ASTRONAUT AKIHIKO HOSHIDE AND ESA ASTRONAUT
THOMAS PESQUEST.

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ALSO, BE SURE TO LISTEN TO

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THE LATEST EPISODE OF “HOUSTON, WE HAVE
A PODCAST”.

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THE FOUR DRAGON CREWMEMBERS, SHANE, MEGAN,
AKI, AND THOMAS,

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SAT DOWN FOR A SPECIAL PRE-LAUNCH INTERVIEW.

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APRIL 22nd IS ALSO EARTH DAY,

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AND A SCIENCE FACILITY ON THE ISS

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IS ANSWERING IMPORTANT QUESTIONS ABOUT

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HOW HARD OUR PLANET IS WORKING FOR US.

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THE ORBITING CARBON OBSERVATORY-3 OR OCO-3

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IS A SENSOR THAT USES SUNLIGHT REFLECTIONS

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THROUGH THE ATMOSPHERE TO MEASURE CARBON DIOXIDE
VARIATIONS

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IN THE ATMOSPHERE AT ANY GIVEN TIME FOR A
SPECIFIC LOCATION.

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PLANTS AND THE OCEAN REMOVE APPROXIMATELY
HALF OF

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THE HUMAN CARBON DIOXIDE EMMISIONS EACH YEAR,

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BUT THAT PERCENTAGE CAN VARY.

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LAUNCHED IN 2019, THE OBSERVATORY IS

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DESIGNED TO HELP DETERMINE THE CAUSES OF THAT
VARIATION.

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DUE TO THE ISS ORBITAL PATH, OCO-3 WILL PASS
OVER FORESTS,

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CROP AREAS, CITIES AND POWER PLANTS.

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THIS WILL PROVIDE A DETAILED PICTURE OF

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ATMOSPHERIC CARBON DIOXIDE LEVELS ACROSS THE
PLANET.

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THAT’S SPACE TO GROUND FOR THIS WEEK.