Re: Naming days of the week and months of the year????

I wrote:
>A planet is a celestial body that's too small sustain hydrogen-to-helium
>fusion (deuterium fusion and lithium fusion is okay). There is no fixed
>lower limit - Mercury is classified as planet, while Ganymede despite being
>bigger is classified as a moon (aka satellite). In practice, if an object
>orbits a planet it gets classified as a moon, if it orbits a star it gets
>classified as planet, asteroid, meteorid, Kuiper object or comet depending
>on size and combosition.
Hm, I got myself a bit messed up, did I? An object that don't have
hydrogen-to-helium fusion, but does have deuterium fusion, would normally be
labled a 'brown dwarf', not a planet. Lithium fusion is relatively
uninteresting in this context, but the really heavy brown dwarfs have it.
Neither deuterium or lithium fusion releases much energy compared to
hydrogen-to-helium fusion.

                                                     Andreas
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