lecture12

lecture12 - Diverse Planetary Environments distance from...

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distance from sun : 0.4 ==> 40AU size/mass : Mercury : 5%M ,0.4R ==> Jupiter--318M ,11R composition/structure : inner--Fe,Ni,Si… outer--H,He,CH 4 Diverse Planetary Environments
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Solar System inventory : sun 9 planets : Terrestrial -- mercury, venus, earth, mars Jovian -- jupiter, saturn, uranus, neptune, pluto (?) total mass = 447 M 170 moons (Jup/Sat -- 62 each!) … = 0.12 M earth thousands asteroids (2.9 AU) : 6 w R > 300 km, 10 6 < 1 km hundreds KBOs at 40AU : few km comets : thousands at > 50 AU (Oort cloud) Zodiacal dust Total mass (mostly Jupiter/Saturn) = M sun / 743
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Orbits : all in same direction coplanar (except Pluto) ==> common & single epoch of origin
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Terrestrial planets Jovian planets Two very different classes of planets !! Why ? formation vs evolution ==> distance from sun critical
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Major Moons :
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two mechanisms : agglomeration of solids -- up to 15 M earth gravitational accretion of gas -- above 15 M earth time ==> 10 6 yr 10 7 yr 3x10 7 yr solids : silicates, metals, ices (H 2 O, CO 2 , NH 3 ) ices only at < 300K ==> at large radii
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T decreases w/ increases distance from proto-sun => different solids condense at different T ==> distances ==> Condensation sequence :
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lecture12 - Diverse Planetary Environments distance from...

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