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Formation
of Solar System
-
Large cloud of hydrogen and
helium (stuff from big Bang)
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Enriched with heavier elements
by star barf (supernova explosions)
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Cloud self gravitates
-
rotates
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collapses into central core
plus disk
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planets form in disk from
collisions with planetesimals
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collisions released a lot
of energy and heat
-
all planets used to be much
warmer
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Inner (Terrestrial) planets
have less gas than outer (Jovian) planets because of proximity to hot sun
-
Analogy in Galilean satellites
with icy material
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