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it's thought that there are 10 times

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more bacteria in our gut than there are

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sales in our entire body there's like

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three pounds of this bacteria in our got

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the size of our brain we know that the

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composition of the bacteria and the gut

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is related to a wide variety of diseases

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diabetes cardiovascular disease once we

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started sequencing everything that was

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in there we found we were just shocked

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if you go into a rainforest and you just

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look at thousands of thousands of plant

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and animal species in the rainforest

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that's what you've got in your gut we

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need to find out what is the effect of

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space environment and so Scott was the

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wonderful opportunity because he was up

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there for a year if there's no changes

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in the microbiota from the beginning to

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the end of the mission that's a good

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sign that we don't have to worry baby

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about the fact that going to Mars and

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back over to your period is going to be

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a problem but we find there are certain

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bacteria that are out competing other

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bacteria in the zero-gravity radiation

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environment well we've got to perhaps

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I'm NASA's Dan Huot and I am taking you

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behind the scenes of a Soyuz landing