There are only eight known planets in the Solar System; I've been saying for years.
The interesting option you missed out is the super-Jovian mass object in the Oort cloud hypothesised as the gravitational source of long-time comets (http://news.bbc.co.uk/2/hi/science/nature/467572.stm). (I call it Krishna.)
Well, I didn't know about it. Still, it doesn't seem entirely unfair to exclude something that it's at best predicted to exist rather than known to in the way all the others are. Granted spotting it might be tricky...
With what evidence? The dividing criteria between jovians and brown dwarfs is normally taken as the latter (a) being dense enough to undergo helium fusion (for a brief period) and (thereafter) convecting. I don't see much (surface) evidence of Jupiter convecting, and it's way below the gravity threshold for helium fusion; which is not to say it might not have been able to do other more esoteric forms of fusion, but if that ever happened, it was very briefly, and a very long time ago, and wouldn't have constituted more than a flash in the planet.
I've no idea. As I say, I don't know if anyone takes it at all seriously. But I've heard it, which is more than any other explanation for Jupiter not being a planet I've.
I meant to include "people who've read 2010" as well as "people who think it happens but haven't proof" in the "non-serious" category, but wasn't sure how to phrase it...
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Date: 2006-08-24 01:12 pm (UTC)(no subject)
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Date: 2006-08-24 01:19 pm (UTC)The interesting option you missed out is the super-Jovian mass object in the Oort cloud hypothesised as the gravitational source of long-time comets (http://news.bbc.co.uk/2/hi/science/nature/467572.stm). (I call it Krishna.)
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Date: 2006-08-24 01:34 pm (UTC)(Earth obviously not being something that wandered around the sky.)
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Date: 2006-08-24 02:43 pm (UTC)Because.
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