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Re: Planets and Moons

From:Michael Poxon <m.poxon@...>
Date:Thursday, November 25, 2004, 12:44
Density as such doesn't really determine that - it's mass that matters.
Planetary orbits (any planetary orbit) are determined by Kepler's laws, and
when you're talking about one extremely massive body (i.e., a star) and a
much much less masive one - even a gas giant like Jupiter - then even though
technically the barycentre (common centre of gravity) is not at the centre
of the star, for most purposes it can be taken as such. A lot of the
planets that have been discovered so far have turned out to be large,
massive, usually gas-giant types. But that's almost certainly because with
current technology, these are the easiest to find. I'm sure there are lots
of Earthlike worlds out there!
> > many of the exosolar planets being found these days fall into two large > categories (though there have been some that fit in neither group)... > > * large molten rocky worlds, Jupiter-sized & as close to its sun as > Mercury. > * large gassy worlds, Jupiter-sized & as close to its sun as Mercury.