Quote:
Originally Posted by isf
Under the theory that the planets got older as you went out from the Sun, how do the outer planets like Jupiter and Saturn fit into this scheme?
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Really they don't. Even in the 19th century people could see that they were a different sort of celestial object. You have Asteroids (really old, blew up like Krypton), Mars (old and dying), Earth (coming into its prime), Venus (primitive and savage), and Mercury (barely starting to cool enough to have the possibility of life).
Bill Stoddard