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Threeplanetaryformationtheories:
1.
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2.
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3.
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Anotherwayoflookingatplanet formation:
Nature 511, 7507 (2014).
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A))
B))
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Warm Cold
C))
B))
D))
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CarbondioxideMethaneMolecularN
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TheAsteroidBelt
TheSolarSystemisfilledwith“leftovers”
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TheItokawaasteroid,1,100feet indiameter. AJapanesespacecraftprobe landedonthe asteroid13.June,2019
and
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TheKuiperBelt
ThespacecraftNewHorizonsisnowinvestigatingtheKuiperbelt
AsteroidBelt
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PlutoisnowregardedasaperturbedKuiperBeltobject,ordwarfplanet. ManyoftheKuiperBeltobjecthavemoons.Thelargerobjectarealmostallspherical,thesmallerarenot
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Ultima Thule: thefarthestandmostprimitiveobjecteverexplored
Calledacontactbinary,22mileslong,4billionmilesaway,AND
NewHorizo
nsmission
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the Oort Cloud,evenmoredebrisfromtheformationoftheSolarSystem
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Examplesofrealplanetformationdisks:
PDS70
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TW Hydrae
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Sowhichformationtheorydoyouthinkisright?