Date: 2005-07-30 06:50 pm (UTC)
From: [identity profile] tavella.livejournal.com
Thing is, any designation other than 'round by gravity' for where to mark the break between planets and other objects is *always* going to be arbitrary. Yes, Pluto is the second-largest of a group of icy objects beyond Neptune... but Mercury is fourth-largest of a group of rocky objects inside Jupiter's orbit. Is Mercury going to get booted if we find a Mercury-sized planet beyond Neptune?
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