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