"Mike Dworetsky" wrote in message ...
(b) far enough from the primary not to be badly affected by
magnetic fields of the primary (in the case of Jupiter this could be a
problem unless the atmosphere is protective),

Or its own magnetic field, one of the Jupiter moons has its own.

Would Earth's present magnetic field protect us if Earth was to
replace Ganymede or Callisto, or Europa for that matter ?


(c) not affected by internal
tidal heating effects such as those that cause Io to be volcanic. The last
of these could be avoided if the large moon is the only large natural
satellite and has a circular orbit, or is orbiting a long way out, like
Callisto. Maybe one would want just enough internal tidal heating to
generate volcanic activity leading to outgassing of CO2, SO2, S2, NO2, NO,
and H2O, so that a breathable atmosphere could eventually evolve.

So, perhaps better be in Europa's orbit than Callisto's ?

Regards

Carsten Nielsen
Denmark