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"HOUSTON, STATION
ON SPACE TO GROUND."

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WELCOME TO SPACE TO
GROUND, I'M LEAH CHESHIER.

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THIS WEEK, THE SPACE STATION'S
RESIDENT FARMER - BETTER KNOWN

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AS NASA ASTRONAUT RICKY
ARNOLD - CONTINUED WORK

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ON THE PLANT HABITAT-1
INVESTIGATION.

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IN MICROGRAVITY, PLANTS
EXPERIENCE A VARIETY OF PHYSICAL

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AND PHYSIOLOGICAL
CHANGES, MUCH LIKE HUMANS.

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ON MONDAY, RICKY HARVESTED
ARABIDOPSIS PLANTS AS PART

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OF A STUDY THAT WILL HELP
US BETTER UNDERSTAND HOW

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MICROGRAVITY AFFECTS
PHOTOSYNTHESIS,

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FORMATION OF CELL WALLS,
GENE FUNCTION AND MORE.

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"WELL, THEY'RE DOING GREAT!

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WE'RE GOING TO GO AHEAD AND
REMOVE THE STEMS FROM THEM,

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AND THEN WE'RE GOINT TO REMOVE
THE PLANTS, FREEZE THEM,

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AND SEND THEM TO THE
GROUND FOR ANALYSIS.

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WHAT'S INTERESTING HERE IS
TYPICALLY THESE DON'T GROW

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TANGLED LIKE THIS."

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THIS STUDY'S RESULTS COULD
PROVIDE GREATER KNOWLEDGE

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OF BASIC PLANT SCIENCE AND
BENEFIT NOT ONLY THE EFFORTS

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TO GROW PLANTS IN SPACE,

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BUT ALSO AGRICULTURE
FOR US ON EARTH.

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DID YOU KNOW THERE ARE MICROBIAL
SPECIES LIVING INSIDE OF YOU?

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THIS WEEK, THE CREW
WORKED ON A STUDY LOOKING

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AT THE BIG ROLE THESE
TINY ORGANISMS CAN PLAY.

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THE MICROBES IN OUR
GASTROINTESTINAL TRACT HELP

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WITH DIGESTION AND INTERACT WITH
OTHER ORGANS - EVEN THE BRAIN.

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WHEN THIS BRAIN-GUT INTERACTION
IS DISRUPTED, THE IMMUNE

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AND METABOLIC SYSTEMS
MAY BE AFFECTED,

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WHICH COULD IMPACT
HEALTH IN SPACE.

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TO LEARN MORE, SCIENTISTS STUDY
MODEL ORGANISMS, LIKE RODENTS,

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BECAUSE THEY HAVE A WELL
UNDERSTOOD GENETIC MAKEUP

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THAT IS SIMILAR TO
HUMAN SYSTEMS.

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BY COMPARING CHANGES
OF ORGANISMS IN SPACE

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TO A CONTROL GROUP ON
EARTH, WE CAN LEARN HOW

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TO PROTECT ASTRONAUT
HEALTH DURING MISSIONS

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AND ALSO GUIDE TREATEMENT
DEVELOPMENT

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FOR HEALTH DISORDERS ON EARTH.

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THIS WEEK'S QUESTION COMES
FROM LANDILE, WHO ASKS WHERE

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AND HOW ASTRONAUTS
SLEEP IN SPACE.

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ON THE SPACE STATION, ASTRONAUTS
HAVE PRIVATE CREW QUARTERS,

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AN AREA JUST BIG
ENOUGH FOR ONE PERSON.

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SINCE THERE IS NO UP OR
DOWN, ASTRONAUTS CAN SNOOZE

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IN ANY ORIENTATION, AND OFTEN
STRAP THEIR SLEEPING BAGS

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TO A WALL SO THEY DON'T FLOAT
AROUND OR BUMP INTO ANYTHING.

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MANY ALSO STRAP DOWN
THEIR ARMS AND HEAD,

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AND SOME ASTRONAUTS
WEAR EARPLUGS TO CANCEL

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OUT ANY NOISE INSIDE
THE SPACE STATION.

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KEEP SENDING IN YOUR QUESTIONS
USING THE HASHTAG SPACETOGROUND.

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WE'LL SEE YOU NEXT WEEK.