One idea that interests me is restricting "planet" to things that account for the majority of the mass in their orbit. So Ceres, which only has about a third of the mass in the asteroid belt, would be ruled out, as would Pluto. That way, we end up with just the eight most obvious planets, but it feels kind of ad hoc.
And on pruning it down even more than that, have you seen Charles Stross' take on all this?
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Date: 2006-08-22 04:52 am (UTC)And on pruning it down even more than that, have you seen Charles Stross' take on all this?