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right now we're about halfway through

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the rosetta mission we've arrived at the

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comet we've dropped a lander off

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one of the things we want to learn from

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the comet is where the water on the

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earth came from what primitive bodies

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may have brought water were comets

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responsible for bringing water to the

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earth

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fortunately water depending on where it

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is in the solar system has a distinct

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signature

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we call the deuterium to hydrogen ratio

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the d h ratio we'll call that a

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different flavor of water and different

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objects in the solar system have

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different flavors

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earth has a very particular flavor so if

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our comet has the same flavor that would

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tell us that kuiper belt comets must be

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the place where the origin of earth's

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water is to be found

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it's exciting for me because it answers

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the question of how the solar system

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formed understanding what our roots are

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it turns out that the flavor of water on

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the comet

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does not match earth's water so we have

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to go back and rethink things the theory

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is not dead yet because there are many

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different comets out there and different

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orbits and so maybe some different

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comets are the ones that brought earth's

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water our solar system has so many bits

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and pieces that don't add up these bits

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of data are crucial to help us put the