On Monday, June 26, 2017 at 9:53:24 AM UTC-6, James Nicoll wrote:
> In article <oir89j$ib6$
1...@dont-email.me>,
> Dimensional Traveler <
dtr...@sonic.net> wrote:
> >On 6/26/2017 8:00 AM, David Johnston wrote:
> >> On Monday, June 26, 2017 at 8:23:25 AM UTC-6, James Nicoll wrote:
> >>> In article <oioc6i$d6b$
1...@reader2.panix.com>,
> >>> James Nicoll <
jdni...@panix.com> wrote:
> >>>> Rogue Queen by L. Sprague de Camp
> >>>>
> >>>>
http://jamesdavisnicoll.com/review/love-is-our-resistance
> >>>
> >>> I verified with James Cambias that yes, de Camp limited himself to systems
> >>> within about 12 LY of Sol and not all of the usual suspects for SF of this
> >>> vintage. Note the absence of Epsilon Indi and Sirius; Sirius might have been
> >>> rejected due to its mass and subsequent short life but I think de Camp was
> >>> skeptical that multiple star systems could host habitable planets because
> >>> neither 61 Cygni and Alpha Centauri are said to have habitable planets.
> >>
> >> Until fairly recently the idea that planets couldn't form in a
> >multiple star system was widespread, although I have no idea why.
> >>
> >Probably because we were operating from a data set of 1.
>
> I think one issue may have been that planets would be perturbed out of the
> habitable zone. Jupiter has managed to hang onto a nice set of moons,
> even though some models suggest it was once closer to the Sun than it is
> now.
>
>
http://www.pnas.org/content/112/14/4214
>
> Say, I wonder what being at 1.5 AU did to Jupiter's existing moons?
Probably very little. It's quite a long distance after all, and I suppose it's the lack of intuitive understanding of the scale of space that leads to such ideas. Many binaries and trinaries are quite widely spaced, enough that there's little fear of significant gravitational influence being exerted as far in as the HZ.