----- Original Message -----
From: Roger Mills <>
> It does seem reasonable that the less the density, the larger the orbit
has
> to be (need to review figures in Viau to be sure that's true; size may be
a
> factor too).
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.