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we are working on something that is the

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cleanest we've ever really attempted to

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send into space

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[Music]

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the perseverance mission has as its

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central goal

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astrobiology and also being the first

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step

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in mars sample return we're going to

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collect a suite of samples about 35

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samples that each weigh about 15 grams

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and the reason we we collect those

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intact samples is that we are the first

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mission that's part of mars sample

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return

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and it's our job to collect the the

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samples intact

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uh to be brought back to earth for

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further analysis

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to better assess the question of was

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their life previously on mars

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inside the belly of the rover sit a

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number of sample tubes

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in an entire adaptive caching assembly

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that is used to

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help collect these samples

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extraordinarily complex

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robotic system and to make it even more

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complicated

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it has to be super clean

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we don't want to have these samples come

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back from mars

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and discover life in them but then

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realize oh

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that's life that was in the apparatus

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when we send it to mars

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that was a a big challenge for the

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mission because we were meeting

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cleanliness standards that no

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no rover mission has ever had to meet

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before the requirements that we have for

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this mission

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are extraordinarily challenging once we

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would go through machining the tube

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itself getting all of our protective

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coatings on there

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and then looking at our beautiful tubes

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we found carbon contamination places we

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were not expecting

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so as a team we all had to really come

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together and look at the entire

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manufacturing process

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how we're handling these tubes we had to

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start polishing the interior board

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prior to putting on some of our

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protective coatings it meant having to

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come up with an entirely new technique

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to clean all of the hardware

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and demonstrate that the hardware could

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maintain that cleanliness

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all the way to mars that's what jpl does

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i mean we

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discover problems and then we solve them

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having these very strict controls in

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this record of how much contamination or

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how clean these tubes are prior to going

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to mars is essential for that return

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sample science

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great discoveries require remarkable

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evidence

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and so the cleanliness of the sample

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tubes and of all the hardware that's

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going to be collecting those samples

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is paramount and making sure that the

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evidence and that the story and that the

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discoveries that come from these

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these samples that are brought back are

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irrefutably

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[Music]