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rosetta is a space mission on its way to

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observe comet churyumov-gerasimenko and

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we're gonna be studying that comet as it

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goes around the Sun in its comets

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journey our study of this comet will

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help to inform us about our biggest

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mysteries where did this comment form

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and what can this comet tell us about

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how our solar system formed the Rosetta

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mission will help us put the origins of

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the solar system into a galactic context

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we're interested in how we turn the gas

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and dust that was the early solar system

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into the solar system we see today in

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particular we're interested in how the

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planets acquire their compositions how

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do we make rocky planets how do we make

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gas giant planets icy planets and then

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we're also interested in the

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distribution of these planets which ones

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were migrating when during the

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construction of the solar system

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comets are key to understanding that

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kind of activity how did it all begin we

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start with this ginormous

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molecular cloud the molecules that form

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our solar systems and begin to condense

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together with a Sun protosun at the

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center and proto planets scattered

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throughout this dusty and completely

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filled disk and right at this time we

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start to ask ourselves where new

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chemicals introduced into our solar

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system at that early formative stage we

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think it has something to do with

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massive stars that are the sister stars

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to the Sun which throw out these giant

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winds and in these winds are these

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radioactive elements and it's these

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radioactive isotopes that tell us

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something about the birth environment of

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the Sun because of this connection with

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our sister stars we think that something

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happened to cause a whole bunch of

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debris to come rapidly forward from the

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outer solar system into the inner solar

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system and did that bring water to the

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inner solar

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but that have brought part of the

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composition of our oceans today on earth

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we need to know where that water came

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from to understand whether or not

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there's earths elsewhere in the galaxy

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we have a lot of questions about did we

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have planets moving around in the outer

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solar system it's possible to Uranus and

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Neptune actually swapped positions and

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excited dynamically the Kuiper belt was

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that the event that caused a huge amount

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of scattering that came forward and hit

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the inner solar system a second idea is

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perhaps Jupiter might have migrated all

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the way forward and then turned around

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and gone back out again to where it is

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now and it's exciting to think about the

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fact that the planets that we all learn

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in grade school you know where they are

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all lined up not because that's where

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they form but that's where they rested

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after a sort of violent beginning

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Rosetta will help us to either validate

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or refute some of these theories this is

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a window into our roofs literally how we

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get from star dust to people you get

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there through the solar system formation

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mechanisms to me the reason to

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understand the origins of solar system

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is to know whether or not we're normal

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well whether or not our solar system is

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a is a common phenomenon in the galaxy