Originally posted by Tanuki:
Wil McCarthy has some interesting speculations on how to cram all those planets and moons into a single stellar system in "Worlds of Serenity" at http://www.scifi.com/sfw/issue439/labnotes.html
Follow the links to "Why Crush the Moon" and "Blue Moons for a Distant Jupiter" too. Real good stuff for Traveller worlds in there as well.
Interesting links, thanks.
Crushing the moon... we've seen no sign of that level of technology. But even the moon, if you give it an atmosphere (by blasting it with comets?) will keep that atmosphere for hundreds of years before you have to "top it up".
Blue Moons I hadn't thought about the sunshade effect ... but the backside of the moon will get brutally hot, exagerative the "evaporative loss" from that side. And any moon close enough to spend a significant amount of time in shadow will also be in the Jovian's lethal radiation belts.
Anybody who saw "2010" should understand the benefits of a brown dwarf. And judging from our Jovians, I could see 2-4 moons big enough to hold an atmosphere, each.
But Jovians (particularly super massive brown dwarves, 8+ Mj) do not play well with others. That is, there gravity perturbs any nearby orbits and either capture them, sling them into space, or spiral them into the sun.
So lets take a big, hot star (F0?) with a wide habital zone. I could see two planets in the habital zone and one brown dwarf with 2-5 moons in the extended habitable zone.
So if you stretch it to the edge of reason, I could accept 3 warm wet worlds, up to 3 habitable moons. One marginal planet at the cool edge with it's own moon, and up to ten habitable brown dwarf moons.
So stretching things to the limits of understanding we get six "inner" worlds (planets anf moons) and twelve or so "outer". Not a hundred.