Last Modified: 2011-10-10
Said to be failed planet formations
Closest to the sun
highter average densities
Farther from the sun
many moons and rings
gaseous/ liquid envelopes are composed primarily of hydrogen and helium
initial gas and dust nebula
dust grains grow by accreting gas, colliding and sticking
continued growth of clumps of matter, producing planetesimals
planetesimals collide and stick, enhanced by their gravity result is a few large planets
this is the evidence of lunar volcanism
they are flat
Linear chain creaters
One probe was ever sent there to do a fly-by
much like the moon and because it is so small it cooled off fast
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